I do have Fractilius, although an old version, working with pspi in a linux installation. From the Redfield site, I see now up to version 2.something.
Some omissions from the OP's posts.
What flavour of Windows Win 7/8, 32/64 bit?
I gave a vanilla
Win7 64bit / Gimp 2.8.14 a try.
Origin of pspi.exe ? Where did you get it from? Version of pspi.exe? I have a 1.0.3 in an archive, Just downloaded a 1.0.7 from a German site (virus total says it is ok) so I will use that one.
First of all pspi.exe, If that does not show at the bottom of the Filters menu, there is no use proceeding. Something wrong with the plugin or an external influence such as AV or it might just be in the wrong place. AFAIK pspi.exe will be a 32 bit executable. Put it in your regular C:\Users\name\.gimp-2.8\plug-ins
Then the fractilius installation. Not much changed from my old version, except it comes as both 32/64 bit.
Quote:
..When I click on install, it takes like a second and I get the message "installation complete"...
OK. Where did you install it to? For this example, I used the standard Gimp profile plug-ins. IMHO not the best place, should have a dedicated 8bf folder, but WTH.
In the plugins folder, both 32 and 64 bit plugins. Disable the 64 bit version by tacking an x on the end.
Screw-ups, example here, the libtiff3.dll needed for the equally old separate+ plugin interferes with fractalius, so that had to be disabled as well
That done, I can go to the PS plugin settings and point pspi to the location of the plugin.
All that done and a restart of Gimp, does it work? yes it does.