Updated Anki from 2.1.15 to 2.1.30 in my macOS Catalina 10.15.4 and nothing works now. Cannot launch new version.
UPDATE: I was able to access an earlier backup.I deleted TagSelectorV2 and now the upgrade works.
start anki while holding down shift key and then disable TagSelectorV2
2.1.30 seems to be causing problems for lots of add-ons 
also about the second error, you probably downgraded to an earlier version without pressing Downgrade & Quit on the newer one?
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Claudia, I think you opened the old version of Anki again, after the add-on was updated to a version that is intended to be used on newer Anki versions. If you make sure to open the latest Anki, I think the add-on will likely work.
Thank you mmdj2. Oh I did not hold the shift key.
Yes. I also had to delete the close hide close all add-on
OK thank you. I had to deleted for the new version. Maybe I will just added again?
If you’ve deleted the old version, you should no longer get that error message when starting the new version.
Hello dee. It was working last time I opened a back up version, deleted the add on and was able to upgrade to the new version. Now I got an error again in the new 2.1.30
hello mmdj2,
As i just mentioned in this tread. I tried open anki again today and get an error.
(I thought I had solve the issue- backed up to earlier version- deleted TagSelectorv2- installed new version and it worked that day- selected download from anki web).
Today I started anki and gave me this error:
The old anki version?
the previous version that you had installed might not be 2.1.26
you can try installing the latest version or latest beta version and try those steps