Unfortunately, I discovered that the BITDEFENDER virus scanner incorrectly blocked a RealTrim Professional-certified file "RealTrim.exe", This already occurs when running the setup program.

Please disable Bitdefender before running the setup program.
Next, add the installation folder usually (C: \ Program Files (x86) \ RealTrim) as an exception to your virus scanner. In addition, please add the directory of your flight simulator as exception. If this file has already been deleted by Bitdefender,you have to run the setup program again.

I am currently in contact with Bitdefender support in this regard

Best regards

realtrim.support