THIS IS NOT AN AUTHORIZED FIX !!!!!!!
however i just made a new l2 file with my C3 file and copyied accross all the large graphics, sound etc basicly everything but system files from my PTS version to there and am running updater with that hybrid version so to speak it is going fast cause i alrady manually moved the large files , just a few map, ststem stuff etc having to be updated is working so far for me will upadte in a bit to let you know how it worked
Since I didn't find a PTS to C4 converter (mind you, there is only a C3 to PTS converter in the download section) I just copied the LineageII.exe from C3 to PTS folder and ran the update.
So far it seems to work, since the login server is down and i'm not getting any farther.
I still cant get it to work.... Been trying to swap some files in the system folder X_x.. Putting c3 system folder into c4 system folder and then running update