[ashlar]

I don't follow

For anyone without auto-update enabled there is the version checker addon, so anyone on v20 or lower will get a one time pop up to say v21 is available. So what would be the sensible thing is to check the status of any addons you use, including skin, before you update. If you don't do this and just blindly update then you'll get an incompatible addon pop up once v21 loads.

And that's on you (the user), obviously. What I was thinking about was a check on the skin in use, before the update process starts.

It could issue a message like "Be careful, the skin you are currently using has not been updated for the new release of Kodi. Are you sure you want to proceed?"

[CrystalP]

@ManilaByNight sounds like a database migration failure. The old database is preserved (named MyVideos121 for Kodi v20) and a migration attempt can be done again after removing the failed new db (MyVideos131), even if only to product a log and diagnose the issue.