Bitdefender Installation & Activation Guide 2021

This guide will help you to Install and activate Bitdefender 2021 Product line in case you have purchased a license key for the same or just want to use the trial version.

Note: Bitdefender has officially removed the version number from the name. Hence, do not confuse if you see only the product name on the official website. Hence for reference, we will call it the 2021 release. 

How to Identify the latest Bitdefender 2021 release?

Once the desktop application is installed, go to the system tray Bitdefender icon and right-click on it. On the menu, select "About". Check the Build number. The latest version release is Build 25.

Bitdefender 2021 release built

Upgrading Bitdefender 2020 to 2021 release

If you are already using Bitdefender 2020 version and want to upgrade, there are two ways in which you can upgrade:
  1. Bitdefender automatically upgrades you to the 2021 version, i.e., Build 25. In this case, you will not have to do anything. Bitdefender will perform the upgrade like a regular update and ask you to reboot your PC.

  2. In case you did not receive the automatic upgrade, you can manually do it. 
  • Clean uninstall the 2020 version using the Bitdefender Uninstaller Tool and reboot your PC.
  • Visit your Bitdefender Central account and make a fresh installation.

That's it. The new installation will be for the latest version. Also, you can verify the same by checking the application build number.

Tips Before Activation (Click to expand)

Install & Activate Bitdefender 2021 release

Bitdefender Installation - activation guide

This section will cover all the steps needed to successfully install Bitdefender Products on your System. To avoid any errors during the installation, follow these steps very carefully.

If you have not yet purchased a subscription and just want to try it, do read our Bitdefender Total Security 2020 review.

Don't have a license yet? Get the lowest price using our Bitdefender Total Security Coupon Codes.


Things to do before Installation

Removing Mcafee Antivirus

If Bitdefender is unable to install even after using Mcafee Removal, try solution below:

  1. Download Mcafee Registry Removal. The password for zip file is: 123
  2. You should now have the 'McAfee.reg' file.
  3. Double-click on the 'McAfee.reg' file and select 'Yes' if the User Account Control window pops-up and also 'Yes' when you need to confirm the action.

Installing Bitdefender 2021: Step-by-Step Guide

  • Login to your Bitdefender Central Account. As soon as you login, you will get options to perform.  Select "Try Bitdefender". Select the next option to install Bitdefender on the same device. Aditionally, You also get the option to download installer for Mac and Android.
Bitdefender latest version Installation
  • Once you have downloaded the setup file on your system, run it. This setup will install "Bitdefender Agent". The agent will initiate the application setup file download from Bitdefender servers and also install it. All you need to do is wait till the process is completed. It might take longer duration in your case if you have a slow system or an unstable internet connection.
Bitdefender installation guide

If you have an unstable Internet connection, you can download the Bitdefender Offline Installer Kit.

Activating Bitdefender 2021 Subscription

If you are using the trial version, upon installation from a new account, Bitdefender automatically activates a 30 Days fully functional Bitdefender 2021 trial for you. We recommend you to fully use the trial version and have the benefit of 30 Free days. Once the trial is over, login to your Bitdefender Central Account.

  • Navigate to "My Subscriptions". In this section, you will see the option to add your license key. Click on the "Activation Code" button present on the top right corner of the screen.
add license to Bitdefender Central Account
  • Once you have added the License, the subscription will appear in the "My Subscriptions" area.
Bitdefender 2019 central account activation
  • Your desktop application logged in with same Central Account will reflect the subscription details. However, it might take some time to update the changes.
Bitdefender latest version update

Installation for Antivirus Plus & Internet Security

Do you have a different product Bitdefender security subscription like Internet Security or Antivirus Plus ? 

After the subscription is added to the Central account, Bitdefender automatically changes the desktop application to match the subscribed product in your account.

Activating on other devices or re-installation

There can be a situation where you have to reinstall Bitdefender. All you need to do is login to your Central Account and install the application. Once it is installed you need to login it with Bitdefender Central account.

These steps also work in the same way for Mac and Android.

How to Install Bitdefender VPN?

There is no special method for the VPN installation. 

On the Bitdefender main application, you will get the option to install the VPN. Once you click to install the VPN, Bitdefender will download and install it for you.

Activate Bitdefender VPN Premium

Bitdefender VPN install & Activate

You have to activate the unlimited premium VPN separately. The process is exactly the same for the VPN activation. You have to visit the "My Subscriptions" section in Bitdefender Central account and add your license.

Incase you do not have a VPN subscription, you can check our Bitdefender VPN Premium coupon section.


Installing Bitdefender 2021 version is easy. If you follow the steps carefully, there are very less chances that you will face any error.

If you face any difficulty in installing Bitdefender 2021 products, do let us know in the comment section below.

35 thoughts on “Bitdefender Installation & Activation Guide 2021”

  1. I am unable to download the manual. It says “blocked plug-in.” I have no plug-ins enabled for this site. How can I get the manual otherwise?

    • Hi Bob,

      Hope you are doing well.
      If you mean the product manual, you can directly download from Bitdefender website.

    • Hi Paul,

      Yes, the guide is the same for Family pack as it is just a combination of Total Security, Android security & Mac protection.

  2. I have renewed my subscription for 5 devices…2019 Total Security. I activated it on my main laptop and now want to know if I need to do the same on the other devices…or once the new sub. is activated is it activated on all devices?

    • Hi Pat,

      Yes, the process is the same. However, after the first activation, the license is not needed. You have to log in the apps with Your Bitdefender Central account.

  3. I bought the Bitdefender 2019 Total Security from Dealasious today, but I just saw that my 2018 Bitdefender subscription expires in 104 days. Will my activation key work in 104 days or does it expire sooner? thanks.

    • Hi Alan,

      If your Previous License is for 5 Devices, your new license will extend the validity, if not the old license will be replaced. As a general rule, licenses with same Device count merge and extend the validity period.

  4. Hi!
    I bought Bitdefender Total Security 2018 on June 15th 2018. When I want to activate it I am asked to enter the code which I don’t have.

    Can you help me?

    Thank you!


    • Hi Gilles,

      Have you purchased it via Dealarious or directly from Bitdefender? If you have purchased from Dealarious store, just submit a ticket at Dealarious support with your order ID.
      In case, the order is via Bitdefender Website, you have to contact Bitdefender support to retrieve your license.

  5. Most comprehensive and easy to find guide on the web. Followed it step by step and voila! No issues at all.. Thanks

    • You can check the same by visiting, Central Account -> My Subscription. This section will show how many devices your subscription is active on.

  6. hello…need little help.Can you tell me how to get activation code for my bitdefender total security 2017.Or where i can find the the code.I have downloaded it from online.

  7. I bought renew my subscription of Bitdefender Total Security 2017, this time a 10 devices instead of the previous 5 devices one, can i use the same bit central account or do i need to create a new one??
    Thank you in advance for the response.

  8. I signed up for Bitdefender Total Security Multi-Device 2017 and would like to install it in early January when my bitdefender 2016 subscription ends. If I download it now and use the activation code will I begin the subscription period immediately or will it start after the first of the year when the 2016 subscription period ends?

    Thanks, Don

    • Hi Don,
      Whenever you use the activation key, the validity count starts. Now, If your 2016 subscription is as same as 2017 subscription, then the license should add up and extend your validity days with 2017 version.
      You can directly contact Bitdefender support and ask them for possibilities for merging the license and increasing the validity days.

  9. Ticket 2016101718590003. It is about switching from a trial subscription to a purchased one. My devices are pointing the the trial subscription even after I uninstalled Bitdefender, deleting the devices and reinstalling. My subscriptions shows both subscriptions, trial with 8 days left and the purchased one active. Contacted support but it was impossible to stay connected. Any help is appreciated.

  10. Accidentally I merged two subscriptions! not it shows as a 24 month subscription.
    Please advice me on separating these two subscriptions.


    • HI Nimesh,

      No worries. Just contact Bitdefender Support and tell them about the same. If you wished to have device number increased and not the validity, they will do the same. Just mention them your Central Account Email.


    I Finally found your OFFLINE Download web page and I Downloaded the version 2016 Total Security version for windows 10 64 bit .
    I Then DELETED any and ALL other Antivirus-Spyware softwares that were on my PC.

    Then when I started to Install your 2016 software I got a POP UP Message saying that I needed to Install a Bitdefender AGENT !! ,, WHY ????

    And where does it say that in any Instructions before I attempt to Install your 2016 Bitdefender Total Security software ??????

    So I think someone needs to Remotely help me INSTALL this 2016 software ,,, PLEASE !! and for FREE ! OK ?

    • Hi William,

      Are you trying to use the Bitdefender Offline Installer? If you get “First install Bitdefender Agent” error when using offline installer, Install the agent from link below.

      Rar Password: 123
      Click on the Agent installer and proceed. Let the agent install, once it asks for Bitdefender Total Security Installation, select Cancel. Else you will be installing from web again. So cancel at that point and now disconnect your internet, use the offline installer and continue with installation.

      Please note that you also have a open ticket. For better support please reply to the support email you have previously received.

      Thank You.

      • Wow..thank you for this info – I’ll try it and hope for the best. I looked EVERYWHERE on BD’s site for how to solve this and there is *nothing* about it. I can’t believe that they don’t bother explaining this. I doubt I’ll be risking anything beyond the trial period considering the level of incompetence.

          • Every time I run the Bitdefender Agent it downloads the entire installer. More bizarre, it seems to completely ignore proxy settings, creating a huge security hole. Even Windows Firewall doesn’t seem able to stop it from downloading the BD installer. If you resort to disconnecting from the Internet the BD Agent stops immediately reporting that something has “interrupted download of the installers” (or something very close to that).

            If the BD Agent isn’t installed the offline installers never give you a way to enter an activation code. However, if the agent *is* installed it downloads the full online installer..and if you don’t let it you’re back to square one. In short, there seems to be no way to do an actual offline installation.

          • Please follow the method below:
            Click on the Agent installer and proceed. Let the agent install, once it asks for Bitdefender Total Security Installation, select Cancel. Else you will be installing from web installer again. So cancel at that point and now disconnect your internet.


            As internet is disconnected, use the offline installer you downloaded and proceed with installation. Once the installation is complete, connect to internet and update the application. If you already have added the license to Bitdefender central account, just use the same account to login into the application. The validity days should appear as soon as the update is registered.

  12. on my side i real i dont understand what what is wrong with my BD internet security, i just bought it three weeks ago from a third part, i installed it succesfully, but it is telling me that DEVICE LIMIT REACHED, i dont know what is wrong, because i just activated my code in only one PC

    • Hi Dotto,
      Sorry to hear that. May I know which license have you purchased? If it is 1 PC License, it won’t be able to install any further.
      If it is for more than 1 device then login to Bitdefender Central account and check the Device names. Delete the unrecognized devices and install on new devices.

      FYI, Unlike other third party sellers, Dealarious provides frees support to its customer for activation queries.


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