If you are dissatisfied with the performance or visual quality, you can use the "Revert Changes"
While not "free" everywhere, the is, or look for the "Half-Life: 25th Anniversary Update" (free if you owned it). However, for a 100% free alternative: "Fossilize" or play the original "Quake 1" via the Darkplaces engine mod (the shareware episode is free and endless). low specs experience premium free updated download