Ive contacted a more experienced person on the matter of the CA public key patching routine failure and hopefully this can help.
"With Steam, one has to either launch the game via their Steam library, or DIRECTLY from the game's executable--NOT from the shortcut that Steam makes.
The proper compatibility to check would be Windows 7 for RA3 IIRC--that, and set the game as well as cnconline.exe to run as administrator"
Thanks for trying to help, cute loli, but this didn't fix it. Whoever made this launcher needs to fix this.