The error "cannot create soundtoys version root folder" typically occurs when the Soundtoys 5 Go to product viewer dialog for this item.
If running as admin fails, a damaged or locked "SoundToys 5" folder likely remains on your system from a prior installation. The installer cannot overwrite or modify it.
"Cannot create SoundToys version root folder at SoundToys 5"
How to enable long paths in Windows 10/11:
Then restart and reinstall.
installer or your DAW (if the error occurs during a plugin scan) and select Run as Administrator
Check SIP and protected locations