I have been using Nitro Pro ever since version 9, with upgrades to each subsecutive version, without any problems ever. The conversion from Windows 10 to 11 (in December 2021, so over a year ago) has not caused any errors either. It's only after I upgraded from version 13.24.1.467 to 13.70.2.40 last week that I ran into the problem of the missing printer driver for the first time. I suspect there have been updates between these two versions, but I have never checked for updates or, for that matter, installed any. So the issue may have existed in some version after 13.24.1.467, but it's impossible to verify.