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I'm using the itch.io desktop app and it says "No manager for installer unknown".  In the stack trace it says "no mapping for file extension .86_64".  I'm running Pop!OS 64-bit:

$ lspcu
Architecture:            x86_64   
CPU op-mode(s):        32-bit, 64-bit

Maybe you have to make the file executable? I found a site with a guide on how to do that, please let me know if it works https://linuxhint.com/make-file-executable-linux/

(+1)

It worked when I manually downloaded + made executable.  I usually install via the desktop app to have automatic updates but I expect you won't be making updates as frequently as games do so it should be all right.  Thanks!

Thank you! I will make sure that version 2 is set up with itchio's butler so that installation and updates are smooth.

thanks!  I really appreciate all your work on this