If you would just like to install your game using wupinstaller then grab wud2app:
https://github.com/FIX94/wud2app/releases
If you dont want to merge all .wud files you can put wud2app into a folder on your pc and run it from a cmd with the wudump folder path as argument, for example if the sd/usb folder happens to be in "P:\wudump" on windows you can just run wud2app like:
wud2app "P:\wudump"
If you do have all .wud files merged then put wud2app into the folder of the merged .wud and run it like run it like:
wud2app common.key game.key game.wud
Make sure to copy the common.key and game.key into that folder as well if you use that method.
The folder it creates can just be installed by wupinstaller.