I had an error message when adding the RCTW plugin to Unity.

"Failed to import package with error: Couldn't decompress package"

I managed to solve this by deleting the RCTW Plugin Folder and coping across the same folder from my partner who also has the game when we found her's worked fine.

Mine had worked once but Unity Crashed and evidently had effected the plugin and hidden files related to RCTW Content Package.

Seems to be working fine now. But as I found have yourself a generic file in Unity that you know works and keep using that.

Hopefully I shouldn't have the issue again.