“unsupported browser” has nothing to do with 7034 ..
.. otherwise everyone would have the notification
There have been isolated cases of users receiving this message with Prime ..
.. and as far as I know, these disappeared everywhere on their own.
Otherwise, I would recommend a clean removal and reinstallation.
I have already confirmed that this happens to me sometimes too
and it works (for me) fine without change in 2nd attempt -> here
Yesterday I dl > 20 files from PV with 7034 and it don’t happen.