Windows explorer extension is no longer working after Win 11 PRO update in 3.30 release

I had a working release 3.30 with context menu working in the explorer on a mp3 file. The MP3tag context menu is no longer visible.
I de-installed and reinstalled releases 3.29 and 3.30 in 64 and 32 bit versions.
No change, the context menu entry disappeared.

Drag & drop of mp3 files still works, so I suspect a change in the explorer extension mechanism or such.

I use this feature a lot, so I really miss it.

You would have to check in Help>About if you have a standard or a portable installation.

Then see if the FAQs about the shell extension help you:

Hello ohrenkino,
yes, I have restarted win11 warm and cold, no change.
I have the installed 64bit version in use.
I could register the explorer extension by hand successfully.
Thank you for your immediate help.