If you're trying to remove your SU Podium licence, but aren't able to do so, you can try the following:
1. Go to the Ruby Console: SketchUp Window > Ruby Console (or Extensions>Developer>Ruby console in the latest Sketchup 2021 update)
Open the Ruby Console.
2. Type in pdm_cl and press enter - this will clear the license from the local SketchUp preference file
3. Now open the SU Podium V2.6 License Manager and activate the license again.
4. After activation, you must Quit SketchUp.
On the Mac go to SketchUp ---> Quit or ⌘Q. Windows file--->Exit.
This action will save the license to the SketchUp preference.json file permanently.
5. Start SketchUp again, go to the SU Podium V2.6 license manager and verify the license is activated.