Windows needs to "install an app for this task" when I try to run the installer?

I have a brand new computer running Windows 11. I downloaded the official FAF client from this site, but when I try to run the installer I get a message saying "you need to install an app for this task." I've tried running as Admin, etc. and nothing seems to work.

What am I doing wrong?

Are you downloading it from here:

I just installed it yesterday on Windows 11 Pro and it worked out fine for me.

A work of art is never finished, merely abandoned

I found this thread describing the same issue, try the fix they found and see if it works. https://www.reddit.com/r/jellyfin/comments/10dyt4h/newb_trying_to_install_you_need_to_install_an_app/