Your old license key will be converted into a Bitdefender 2017 subscription. Buy Bitdefender Antivirus For Mac 2 Years 1 Dev Software License CD Key. NOTE: If you have an old license key you can go to your Bitdefender Central account, and under My Subscriptions click on the ACTIVATION CODE. Then click on GET YOUR FREE UPGRADE NOW! and input your old License Key. After Bitdefender finishes installing it will automatically add the remaining days you had left on your old Bitdefender as long as they are the same product and are for the same number of users. Now, just follow the on-screen instructions to complete the installation. Step 8: The installation process of Bitdefender 2017 will start on your computer. Step 7: After Bitdefender 2016 is uninstalled, you will be prompted to restart your computer Step 6: In the process of installing Bitdefender 2017, you will be required to uninstall BItdefender 2016 from your computer and you will be assisted to do that. Step 5: Wait for the download to complete, then run the installer (right click on the file you’ve saved > Run as administrator) NOTE: If you want to install Bitdefender On another device, select this option ( this way you will send an email with the link to the installation agent to an email address of your choice). Step 3: In the My Devices window, click INSTALL BITDEFENDER.