I am also having the same problem. My history of downloads stopped working around December 11th. This is really important for me as my site needs to track downloads for legal reasons.
I was autoupgraded to version 3.1.12 at some point. It Would be nice if your change log listed dates
I am on WP Version 5.6
I am using PHP 7.4.14
I have disabled every plugin except for the downloads plugin. I usually host files on s3 so I used WPDM but I have also disabled this and tried downloading files from the media library.
I have also tried different themes
It does not work.