> Just don't cut out things - how hard can it be???
Are you serious?
... if yes, then you have no idea how these things works. Initially it would be like extra 30-80% of work, until it would become completely impossible to keep the versions compatible, then you would be left almost alone in the multiplayer.
Just keep running the older versions (the old game) offline, if you can't upgrade your HW.
The patched LFS is not old, but new game.
About how would buying help. Let's be real, there's no chance to keep DX9 working, not if only one customers wish for it, but generally buying the license makes difference. People without license are basically just noise.
I'm surprised you did got even some replies from users, we are probably really bored.