Not the first time that I've noticed (from others) that a GIMP plugin won't work under the portable GIMP version. Don't use Portable GIMP so I don't, unfortunately, have a solution for you O.

Well, finally. For some reason the install file made a folder in my plug-ins folder named, gimp-cit-0.1-64bits. In the folder was the file named clone-layer.exe. I moved clone-layer.exe out of that folder and moved it directly to the plug-ins folder and it is working now.

Later note: I see what I should have done now. After I unzipped the plugin, I should have double-clicked the resulting folder, copied clone-layer.exe and put it into the plug-ins folder.

I'm just not used to Windows anymore and I'm like a noob in there.

Now, to figure out how to use it.

Oh yeah i should have mentioned that you only need the exe file...
Glad to hear you got it working O!

My first try at it. Need to work more with it.

Excellent news and cool result use made O. Glad you got it to work. I still have high hopes that David (G'MIC) will port this baby into G'MIC so I can have it work in 2.6.11. There is a Script-fu that can do this too, but it's slow and doesn't have all the features that this plugin has.

I know this plug-in is so fast!