This is a bit hard to explain. Let's say you install the legendary item's pack and it works properly. If you want to add another items pack, you have to move all of those items into their proper folders but you cannot override items.cfg. Instead, you have to open the file via notepad and copy the text from the items.cfg of the items you want to install and paste them after the legendary item's place in your game's items.cfg. This basically adds on the second item pack without overriding legendary markings. Of course, if you want your friends to see the items of the second items pack, they'd need to have theirs installed in the same manner. If not, they may not see anything or completely different items as the placement of the items files may differ in their items.cfg.
