@TBugReporter said:
FYI: I finally found the solution for this on bruderstein’s issues tracker: Apparently the job of downloading plugins gets passed off to IE, and the problem is the result of a misconfiguration within IE. To fix it, go to the “Internet Options” screen (either from Control Panel or IE itself), click the “Advanced” tab, scroll to the bottom, and check “Use TLS 1.2”.
(Another good idea before you exit would be to uncheck the other SSL and TLS options, because they’re no longer considered secure.)
I’ve searched a lot but this is the only right solution.
Thank you very much!