Oh you need to run chmod +x Upstream.x86_64
It's a native executable but I don't know if there's a way for linux to recognize it as such automatically. I'll update the description.
Thanks. My Linux didn’t recognize it automatically because of missing permissions, and because the filename didn’t end with .x86_64 this caused me the user to not recognize this file as an executable either.
If the filename ended in .x86_64 i would’ve tried to open it as an executable, and then i would’ve gotten the error message about missing permissions, and then i would’ve changed the permissions with the help of looking up Linux change permissions on the Internet Search Engine.
you should update the export so that the executable is actually named upstream.x86_64 instead of just Upstream.