Would try the cleaner first.
Please delete the trainer, custom keys, debug folder where the trainer resides and all files in
C:\Users\USERNAMEHERE\AppData\Local\Temp
C:\Users\USERNAMEHERE\Cheathappens\Work
C:\Users\USERNAMEHERE\AppData\Roaming\Cheat Happens\0x90
C:\ProgramData\CheatHappens
Learn how to make your own Trainer Cleaner for the above paths here.
Reboot PC to clear excess memory, get a fresh copy of latest trainer and extract it. Run trainer as admin, read the instructions and try again. At times, a new game may be needed to resolve failed options if the data in your save file was altered. Use on a new game and test the option. If it now works, quit to main menu and load your save and try it again. May also need to run the game without the trainer first and play a bit so the save file gets updated to use possible new values. This typically will resolve the issue.
This cleaner is also part of the new Cheat Happens Trainer Manager 2.0, it is found in the settings and has an easy to use one button click feature.
Done all this, even uninstalled the game and reinstalled. No antivirus or firewall in operation. Getting the following error report.
18:03:20: Cold Waters, 1.15g (STEAM)
18:03:31: Successfully attached to ColdWaters
18:03:31: After several retries failed to create pipe:
System.IO.IOException: All pipe instances are busy.
at System.IO.Pipes.NamedPipeServerStream.Create(String pipeName, PipeDirection direction, Int32 maxNumberOfServerInstances, PipeTransmissionMode transmissionMode, PipeOptions options, Int32 inBufferSize, Int32 outBufferSize, PipeSecurity pipeSecurity, HandleInheritability inheritability, PipeAccessRights additionalAccessRights)
at System.IO.Pipes.NamedPipeServerStream..ctor(String pipeName, PipeDirection direction, Int32 maxNumberOfServerInstances, PipeTransmissionMode transmissionMode, PipeOptions options, Int32 inBufferSize, Int32 outBufferSize, HandleInheritability inheritability)
at .()
18:03:31: Connecting to mono pipe failed
18:03:31: ammo, Script error in line 3: 'PortRearm:SetLoadoutStats+9DD' is 0 or not a valid address