c:\ProgramData\pimax
c:\Users\ username \AppData\Roaming\PiTool
c:\Users\ username \AppData\LocalLow\Pimax
c:\Users\ username \AppData\Local\Pimax
c:\Users\ username \AppData\Local\PiTool\
u no need delete it EVERY time when u install new version. But if u have troubles - it can help.
(253 and 262 versions have low fps if u using 258-261 before. So u need delete files)