So, this is the guide: https://gist.github.com/Irastris/31766414a981a056d49c1242a019829a
It talks about FunKiiU (which works fine on Linux) and cdecrypt (which is Windows-only).
Are there alternatives to cdecrypt which run on Linux?
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i know this isnt super helpful but i used a tool on my steam deck that could both download and decrypt wii u games through a gui, i dont remember the name though. it took a while for me to find while i was looking for alternatives while trying to get other tools to work