It wasn't old when I got it, bought a full license. Staying on 4, fuck 5+. I didn't actually get it for windows updates, I just have shit internet and anything thats fucking with it when i don't tell it to gets limited to 1KB/s, or blocked if that doesn't work well. Just so happens to work with windows shit as well.
I'm just on w11 because maintenance is significantly easier than redoing everything.
I bailed on RS3 a couple years ago for OSRS, recently liquidated my RS3 bank to fund bonds for my hardcore ironman on OSRS haha.