Follow the steps below to remove a device from your Bitdefender subscription to free up a slot.

1.  Go to Bitdefender Central and login into your account using your e-mail address and password.

2. Go to the My Devices section.

3. Select the device you want to remove and click the VIEW DETAILS / VIEW ISSUES button.

4.  Click the three dots settings central in the upper-right corner and then select Remove.

5. Then check the dedicated box to confirm that you understand the risks of the action and select REMOVE. The number of devices on your current subscription is updated shortly.

NOTE: Before removing the device from your Bitdefender Central account, make sure you uninstalled the Bitdefender product on that device.

See this article to help you with installing on Windows PCs: Uninstall Programs in Windows & Uninstall tools for antivirus software

Source: https://www.bitdefender.com/consumer/support

Remove a device from Bitdefender Central