Nyfure is right. Wayland support is experimental but has been added to Rust Desk since earlier this year.
I haven’t tested it on Wayland myself, and remote login isn’t yet supported according to their GitHub documentation, but if you just need a reliable way to provide remote support to your fam, it’s a really solid option.
Wayland is quickly becoming the standard, and Rust Desk seems to be on that train which is good. I wouldn’t be surprised to see full Wayland support or close to it by the end of next year.
Also, I just use the .appimage file and it works fine for me. Just make sure to set it as executable with chmod +x or in the file permissions tab in your GUI.