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With the Ultimate Collection version of Red Alert 3, you actually don't need to apply the 1.12 patch to your game. This digital version of the game, as well as the Steam version, do not require the 1.12 patch as they are already updated to their proper versions.
To fix the registration code issue, simply tell Origin to repair your Red Alert 3 game installation--that 1.12 patch replaces the regular game.dat file with a CD version (aka, a version of the game.dat file that requires one to use a CD version of the game--which is not possible for The Ultimate Collection obviously XD). Just go into your Game Library in the Origin desktop app, right click the game, and select the "repair" option.
The links for the fixed launchers have not been updated yet; the old solution had to be removed per the creator's request. You may still be able to find a copy of it somewhere (they're Bibber's fixed launchers), but they're very scarce.
However, I've created my own fixed launchers that pretty much do the same thing as Bibber's old ones. You can grab them from ModDB: https://www.moddb.co...-launchers-v100
It's a pretty simple and straightforward installer for the fixed launchers. Just be sure to disable Origin In Game and Cloud Saves for whichever games you want to patch with the installer.Go to the full post