Nothing is working for me.
Windows 10 Home - fully current with updates.
Old version installed, 1.8.5 does not.
After telling it I want to install, a small window pops up for 1/4 Second. I can see "preparing....." in it, and that's it. It does not install.
Tried running as administrator, and used the compatibility trouble shooter. Nothing works.
As to Juan's suggestion, he did not indicate what directory to modify, and this shouldn't be the issue anyway, as other programs, including the last version of P install without any problems.
George