As @menglxs has mentioned,the ReSound SmartFit software would be the best bet, this is how I updated my Airlink2…but as you have already tried this without success, it’s looking more and more like a paper weight ; (
But just out of curiosity, did you download the patch/upgrader from here, is this the same one you used?
https://himsafiles.com/NoahlinkWireless/NLWUpgrader_Apr19.exe