If a version is unlockable is dependant on the master server IIRC. So you basically have two options: find a download link for LsF S2 0.5 Alpha Q and either unlock it ordinarily, or, if it soean't work, use a crack. You can't play multiplayer then, but I guess that wouldn't be a problem, as nobodoy plays Q anymore anyway.The last option though is not only of a very dubious morality (we'll you paid, but, you know, supporting cracks is still bad, unless a game is made by EA), but I also don't know if it would break any EULAs or something and might get your account banned if found out.
On a sidenote: Why would you want to play Q anyway?