A lot of old games - yeah, they don't activate online unfortunately on services like GOG, Steam, Origin, etc; that shows what companies think of old games...as they'd probably rather you buy inevitable Remake or Remaster for $60-70 instead.
GOG stopped its GOG Reclaim (to reclaim SOME disc-games) & GOG Connect program (to bring some of your Steam games over to GOG) recently and killed them both...unfortunately.
You'd probably need to find a disc-cracks and make sure those cracks ain't got viruses in them; use at your own risk, of course.
And if there's any games that got official patches that removed DRM-checks (like say Beyond Divinity w/ Patch version 1.49) - use those.
And you're probably ASAP going to have to uninstall any crummy DRM drivers like Tages, Securom, SafeDisc, etc. In many cases - when old games are cheap, you might want to re-buy them, to avoid DRM of that sort...which can cause problems w/ newer Windows OS's and newer hardware. Steam and GOG are great places to buyt old games.
About Freedom Fighters - that game's been so cheap on Fanatical and GOG so many times at $1.90 to $3 or so, so might as well re-buy. See ITAD on Freedom Fighters' price history ->
https://isthereanydeal.com/game/freedomfighters/info/
If you got Alder Lake, check this out. Here's how you go into BIOS to try to get around problems that it has w/ certain DRM-types on W10 and W11 ->
https://www.tomshardware.com/news/intel-offers-workaround-drm-issues
If you got old-systems - might wanna just play those games on those systems, if you still got them and provided those systems still work and all.
Another idea - depending on how much power & system RAM you got inside and also how much RAM want to allocate virtually, maybe you'd want to use VirtualBox and install old Windows OS on top of W11 that way? Or maybe straight-up dual-boot if possible older Windows OS's onto your system or Linux? Never tried any of those - and I'm lazy, but probably should try these ideas, one day - but there's some ideas.