Thank you! This works. I suggest that you zip that app though. On your Mac, you can simply right click on the app in finder and select the option of "Compress...". This will create a zip file of that app. Then share the Google Drive link to that zip file. That way people will easily be able to download the file and extract it into their apps folder.
But THANK YOU, this works. I hope others find this helpful. So, at this point, we have now validated that MSFT did introduce a broken app that is not supported on Big Sur or older versions of Mac OS and Apple has allowed them to publish it in the app store as if it does support these older versions. Typically the App Store would say, that your version is not supported and it would give you an option to download the older version (aka v2.110).
Hopefully one of these companies will fix their problem and then we can not have to rely on the above link to download an old copy. The app store is already nagging me to update the To Do app to the latest version since installing your backup copy. :)