Hmm, I've ditched Rainlendar for quite some time now, plus switched to Litestep who has it built-in, but as far I can remember it was program files/rainlendar/skins/x.
Make sure that the .ini of this x skin is inside this x folder and not inside some x subfolder, as it can occur when you unzip stuff.
If not that, I don't know what could be, just know that there were new versions of the program and never tried them out, but doubt it changed this. Hope you can make it work.
Not sure, but have you tried to right click your current skin. Then choose "Refresh all" and then the new skins should show up in the list, if you have them in your skins folder.
