Please closely follow the below steps to manage to Uninstall any trace of failed installs:
 
Download the uninstall tool from this link: https://www.bitdefender.com/site/Downloads/uninstallIntro/uninstall_business.html
   • Reboot the endpoint in Safe Mode.
   • Move the BEST_uninstallTool.exe directly under the C:\ drive
   • Open an elevated CMD prompt (with administrative rights)
   • Go to C:\ using the cd command and run: BEST_uninstallTool.exe /bdparams /bruteForce ( if it fails, please also try the following command: BEST_uninstallTool.exe /bdparams /bruteForce /unsafe)
Wait for 3 minutes and reboot the endpoint.

·         make sure that the Bitdefender folder is no longer present in C:\Program Files; you can remove it manually if necessary.

·         go to Registry Editor >Computer>HKEY_LOCAL_MACHINE>SOFTWARE;                                                                          

·         here check for EndpointSecurity.remove and {AAD1516D-28AB-4EB5-B7C8-DF54FE4442E9}.remove and delete them if they exist;
- Go to C:\Windows\System32\drivers and remove these 3 files (if you are unable to remove them, try restarting the machine in Safe Mode, as the service appears as running so it might be persistent to a delete task):

·         bddci.inf

·         bddci.cat

·         bddci.sys

Please perform the following check: Control Panel -> Administrative tools -> Local Security Policy -> Local Policies -> User rights assignment -> Load and unload device drivers.
If the local user does not have the necessary rights (to install drivers) the installation cannot continue and fails.
 
Please  try to install the product using a new Windows Full kit, downloaded from Gravity Zone:

·         To start downloading the product from the console, you need to go to Network>Packages->press the + button and create a kit (Endpoint).

·         Once you create the kit, select it and from the right-hand menu press the download button. In here select the package Windows Full Kit.

·          Unzip the install package and be sure that the file "installer.xml" is in the same folder with the file "epskit_64".

·          Please run the "epskit_64" and install Bitdefender Endpoint Security Tools 

You should be able to install it successfully after restarting the machine and deploying the latest version of the Installation Kit.