Unable to open Anki

you have installed an older version of anki while your collection is for a newer version.
install the previous version of anki that you had from here (you can install the latest beta/alpha version if you don’t know which version you had installed from here )
when you installed the latest version, go to “File -> Switch profile” and press “Downgrade and quit” then install the version that you want to use.
it should solve the problem

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