See Pwizard's post above.
Delete trainer and all files in
Reboot PC to clear excess memory, get a fresh copy of latest trainer and
make sure trainer is in a folder excluded from virus scans. Empty quarantine folder if needed.
may need to be added to exclusions as well. Run trainer as admin, read the instructions and try again.
Anti-virus help page. Link
Have both latest CORE Link (Both of the Net-Core MUST be installed x86 and x64) and FRAMEWORK Link from Microsoft.
if you mean you tried to launch the game folder you can make a shortcut that works by pressing the Windows key + R then type shell:AppsFolder and then search for State of Decay 2 in the list and drag it on the desktop fixed that problem for me
oh and if you press F1 ingame and it says game not found try the other version of the trainer by that i mean if you have the window version try the steam version
[Edited by mickev, 3/14/2020 7:44:44 PM]