Hi. I'm running it on 1.3.1 and it seems to work just for me, visited most of the worlds without any texture issues, only replaced Kopernicus with the latest version from CKAN, since the one in this pack is not compatible. Also deleted Gaia to restore Kerbin to it's original state, since I'm a noob and need that, however I can confirm that it's a bit laggy with the original Mun as Gameslinx mentioned somewhere in this thread.
Gameslinx, great work! This is my favorite planet pack by far. Looking forward to an official update for 1.3.1!