It's very frustrating and the delete app by reggieashworth isn't advertising that it works with Big Sur. My iMac is a newer 2019 with Big Sur 11.6 as well and I haven't been able to download using Google Chrome since I set up my gently used iMac last week. The odd item is my MacBook Pro 2018 laptop has the same version as my iMac and it downloads everything just fine.
I would use Safari BUT Safari does not play well with SalesForce. Hello - I have done ALL of the items listed by Google and on the helpful websites and deleted with the /appdelete and reloaded the Chrome download from the above link and still receive