Unable To Use Downloaded Skins For First Time Ever

My game constantly crashes when using custom skins (Vitrex was the first one i noticed), the game will crash (dump) randomly if i add one when playing and then when i try to restart it just gets stuck on the loading screen meaning i have to remove the skin from the folder before i can play again. I am using all the usual graphic addons that i have used for many years and never had a problem until now, have also tried 'verifying game cache' in case something was missing but made no difference. Finding it quite annoying as do like to use backgrounds but now i can't even view them in my game

As i said i have never ever had any problem installing and using skins, graphics etc but this year for some reason it appears impossible to use a different skin.