Same here... I will do another Update-Request for that option
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.
You'd better use a Mod for that Option I guess.
There are 3 or even 4 Mods on the Steam-Workshop, each with configurable Stack-Sizes.