Oops didn't get back to this. Act 1 is a part of the games anyways? So if you specifically mean the ancient build containing ONLY act 1, they exist, it's literally on this site, so I assume the functionality is there, just gotta look into it.
But the actual act 1 content is in the normal game. Act 2 is both acts 1 and 2. Same with 3 which we are uploading right now :>