Re: C12 Error SWTOR: CAN'T FIND DAT FILE??
Try the repair utility here
Edit - FYI the method to repair is determined by the patch method, you will be streaming, the bitraider folder is meant to come back as deleting it triggers the repair.
Non-Streaming launcher - Log into the launcher but don't click Play. Check for small letters "ST" in the bottom left corner.
If this is NOT present, With the new launcher after login , select the username pulldown on the top right and select settings, then press repair.
Streaming launcher - If the letters "ST" is present, close the launcher, right mouse click on the game shortcut,
Streaming launcher - If the letters "ST" is present, close the launcher, right mouse click on the game shortcut,
select open file location and delete the BitRaider folder. Then start the launcher