Hi Danny
Are you installing for “All Users” on your machine?
I presume the installation is successful, and you get this message when you open Rhino 6?
Are you installing PT and ST for the first time, or you had them working in previous service releases of Rhino (prior to 6.5?)
@JohnM, you may also want to take a look at this. It looks like the RUI system is trying to write a temp file in a location that Windows doesn’t allow on this system.
It looks like the wrong RUI file is getting opened, you need to go to the Rhino “Options/Tool bars” page and close the Paneling Tools RUI file located in the “C:\Program Files” folder then open the file located in your “C:\Users\user\AppData\Roaming\McNeel\Rhinoceros\6.0\UI\Plug-ins” folder.