Just speaking from my own experience, I can only use it when/if I have an XP computer running.
Not only does it NOT RUN on a Windows 7, 8 or 10 system, it will NOT accept my registered Serial Number to activate it!
All I got from an email from the folks at Haptek was a "Sorry it doesn't seem to work with 7, 8 or 10."
Not that good for customer support and it certainly seems they did not keep up with the changing Operating Systems.
Such a shame because it was a really fun and extremely versatile product for the creation of countless characters!
Perhaps something will develop in the near future.
SO IF you had an XP OS and a copy of People Putty, you'd still need that original, unique Serial Number to activate it.
Good luck!