-download and install Everything(search program),
-add it to context menu(right click menu) when you install it
-right click the add-on, search with Everything
-type GUI, then right click GUI and search with Everything, type icon. Right click blank space in Everything and set to large thumbnails. Set Everything to search for images only in "View" tab.
-find your add-on and copy the name. Set Everything to search for everything.
-then right click add-on repack and search for that name and you should find all related files using that name: acc, dress, scene, texture, txf and icon.
-select and copy them all in another folder
-create Scene, Scripts, etc folders the same as the add-on pack. If you don't know where the file should go, search again in Everything and it shows the path. You have to create that same folder structure. After you create the folders, make a copy for future add-ons.
-after you're done, name your add-on folder and compress it as zip. Sometimes, game doesn't add folders for some reason. You can extract it after you see it working in game.