You said where you got the "plug-ins" but not which plug-ins they are. But no matter.
I suggest you contact the plug-in supplier and ask them. It could be that they haven't updated their product for CC, that they appear elsewhere in CC, or some other issue.
The plug-ins are:
- 65 Premium Actions Set by PrismaDesign
- 90 Premium Actions Set also by PrismaDesign
On their website they said
06/12/2013 – TESTED: The 65 Premium Actions Set also runs on Photoshop CC
06/12/2013 – TESTED: The 90 Premium Actions Set also runs on Photoshop CC
In windows 7 I found the plug ins under User/Roaming/Adobe/Photoshop CC........... Don't know how this compares to Windows 8
My thanks for your comment!
The path that you suggested where any plug-ins might be, cannot be seen in Windows 8.1. Even when I checked the "Show hidden files, folders and drives" option in "Explorer> View> Options> Folder Options> View".
They have changed the structure of Win. 8.1 from previous versions.
Other suggestions are very welcome.......