I can't go to tools>check database

I can’t use my Anki anymore and I can’t restart it because it always says “go to tools>check datbase” but my macbook won’t let me open it in the top bar menu.
Also it always says:

"Fehler
Es ist ein Fehler aufgetreten. Bitte starten Sie Anki neu und halten Sie während des Startvorgangs die Umschalttaste gedrückt, damit Anki die installierten Erweiterungen temporär deaktiviert.
Wenn das Problem nur auftritt, wenn die Erweiterungen aktiviert sind, dann benutzen Sie bitte den Menueintrag Extras > Erweiterungen um die problembehaftete Erweiterung durch selektives Deaktivieren herauszufinden.
Wenn Sie die entsprechende Erweiterung herausgefunden haben, dann bitten wir, dass Sie sich mit einem entsprechenden Problembericht an die Support-Seite für Erweiterungen wenden, damit der Fehler behoben werden kann.
Debuginformationen:
Anki 2.1.35 (84dcaa86) Python 3.8.0 Qt 5.14.2 PyQt 5.14.2
Platform: Mac 10.16
Flags: frz=True ao=True sv=2
Add-ons, last update check: 2022-10-17 08:39:14

Caught exception:
Traceback (most recent call last):
File “aqt/main.py”, line 1016, in closeEvent
File “aqt/main.py”, line 462, in unloadProfileAndExit
File “aqt/main.py”, line 439, in unloadProfile
File “aqt/main.py”, line 548, in unloadCollection
File “aqt/main.py”, line 812, in closeAllWindows
File “aqt/init.py”, line 118, in closeAll
File “aqt/main.py”, line 546, in before_sync
File “aqt/main.py”, line 922, in maybe_auto_sync_on_open_close
File “aqt/main.py”, line 917, in _sync_collection_and_media
File “aqt/sync.py”, line 120, in sync_collection
File “aqt/main.py”, line 912, in on_collection_sync_finished
File “aqt/main.py”, line 699, in reset
File “aqt/main.py”, line 661, in moveToState
File “aqt/main.py”, line 683, in _reviewState
File “aqt/reviewer.py”, line 65, in show
File “aqt/reviewer.py”, line 118, in nextCard
File “aqt/reviewer.py”, line 183, in _showQuestion
File “anki/cards.py”, line 113, in question
File “anki/cards.py”, line 133, in render_output
File “anki/template.py”, line 115, in from_existing_card
File “anki/cards.py”, line 144, in note
File “anki/collection.py”, line 309, in getNote
File “anki/notes.py”, line 34, in init
File “anki/notes.py”, line 40, in load
File “anki/rsbackend_gen.py”, line 350, in get_note
File “anki/rsbackend.py”, line 267, in _run_command
anki.rsbackend.NotFoundError"

This occurred after I tried to download a new Anki version (maybe it was the wrong one for my macbook which is rather old) .
I can’t close Anki and therefore can’t restart my computer since Anki is open and can’t be closed
I am out of ideas.
Please help me…

First close Anki, reboot and see what’s possible then, following the hints from the error message.

Please follow the steps on When problems occur - Frequently Asked Questions, including updating to the latest Anki version.