Thanks for the links (discord link expires when people aren't there anymore, I take it). But....
The page above tells you how to get it working on Windows 7 64-bit, which I have already figured out (the page was last updated in 2012, 3 years before 10 came out).
I can get it 100% working perfectly in 7 (and 8.1), but in 10, it either won't launch at all, or it will work only in Software mode (the latter when I use GOG without any patched EXEs). A lot of pages link to files on jkdf2.net but they've changed their links around in the last few years so a lot stuff can't be found on the old tutorials. Otherwise, good page.
To be fair, I have not played an online game in about 15 years (back before I used wifi), so I have no proof it works for me on there yet, but I do see if I launch with gameranger, the game shows up in JK Launcher, so I assume it's working. I can launch a game, but until I see that other person with me, I'm going to be in suspense!!!
Still want to try though... at the end of the day I know I can dig up a bunch of old beat-up pcs with old versions of Windows installed, but if this is possible, why go to all that extra trouble? As for me, I use 7, so I could play anytime, but my friends all have 10, so the "how to" is more for them.