If i download lfs again but have no more lfs unlocks will i still be able to use s2 if i remove my other copy as its corrupted?
Whenever you download LFS, always test it in Demo mode first. Don't keep unlocking it as soon as you startup a fresh downloaded copy. Chances are, the files are not corrupted, it could be any number of things.
Chances are that IF a file is corrupted, then reinstalled that file and that file alone will cure your problems. How do you know/Why do you think LFS is corrupted?