Hey! I didn't try enabling TLS 1.1 and 1.2 because I'm on Windows 8.1 and gPodder downloads the episodes, so I just assumed if it needed those TLS's, I already had them. (Plus, I just checked, and I don't even have those registry entries.)
(Edit: I JUST realized that he suggested running that script as a .reg file. But I'm Windows 8.1, not 7, and I'm still a little afraid of tinkering with the registry. Will this Win7 suggestion screw up my Win 8.1 system?)
I'm on MB v.3.5.8419 (no letter), installed normally, from the installer file, but I think it might have been the update installer. No store.
Musicbee IS in a Virtualbox on Linux Mint, but again, everything worked perfectly until a couple weeks ago. gPodder is ALSO in my virtualbox and downloading the files successfully, so it shouldn't be the VB's fault, since I haven't changed anything recently.