I thought... if DEM files are the same of PCM 2014 I can overwrite the damaged files of PCM 2015, but I don't know if are compatibilities. I see that in PCM 2014 DEM folder is 2GB, in PCM 2015 is 800 MB....
I have this problem during installation by DVD, with this file and the following file .dem. I installad the game pushing "ignore", but now I don't know if I can have problem hereafter