Hmm... not sure if the Westwood Studios folder was there before (do you mean before I installed RenegadePublicTools/Level Editor?), I installed C&C Renegade sometime in 2023 (maybe around March-April) and haven't gone into the registry for anything related to Renegade/Level Edit/Westwood Studios until today. I didn't have to (manually) add any new folders named 'Westwood Studios' though. Hmm...
Checking for a folder Wow6432Node was successful, but there is no Software folder listed underneath.
Thanks for the response.
Edit/Update: Success! Thanks to additional help from ChopBam and elbappotsnU in combination with following instructions in this thread (moonsense715 and Jerad2142 posts), the Level Editor is now working:
Windows 11, 64-bit
Scripts 4.8 installed
Level Editor doesn't have empty folders in the Presets Tree/Window, there are now the default presets for soldiers, vehicles, props, etc
Level Editor .exe from the Scripts 4.8 'Tools(http://www.tiberiantechnologies.org/downloads)' download is present
Using an install of C&C Renegade from the 'Command & Conquer Ultimate Collection' purchased via the EA App software
The main fix seemed to be going into the regedit to define + create an InstallPath string/entry as Jerad mentioned, but making sure for Windows 64-bit systems (I was on Windows 11), the registry path to use is actually going to be 'Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Westwood\Renegade', this should get the Level Editor to load in normally with default presets from Renegade automatically loaded in!