Then you don't need your friends help if you think you deleted the original textures; just verify the game cache and it will replace any missing files. https://support.steampowered.com/kb_article.php?ref=2037-QEUH-3335 P.S. It's generally impossible to erase the vanilla game textures since they are all packed in BSA files. When you install a replacer (like Robert's for example) you are simply creating the same file directory as the the assets you're replacing outside the BSA files; thus overriding them rather than replacing them. Simply deleting the new files is usually enough to revert back to vanilla assets.