I don't have the Portals Revamped extension, but I have the CSV table importer.
When you are on the load campaign screen, the extension appears as "CoreRPG- CSV Table Importer" - can you run an update and double check for that?
If you still can't see it, go to your FG app data directory (click the folder icon in the top right of the FG launcher), open FGUpdaterEngine.log in a text editor and search for 2bbeb32e-d54e-11eb-8c52-0050562be458 (this is the reference ID of the CSV Table Importer product). You should see that listed in a section after "Getting Forge subscriptions..."
The identifier for the Portals Revamped extension is 05848d44-ec34-11eb-8c52-0050562be458 - you could search for that too.
If you're still having issues, please attach your FGUpdaterEngine.log here after running an update, so we can check to see if that indicates what the issue may be.