The title says it...is this possible? How do I do it? And, why does 1.1 look so weird, I thought it was newer.
Yes, you can.
Just upload the rc3 files to your forum directory and overwrite the old ones.
Then run upgrade.php and voila.
Will there be any problems when I do this? Is the database fine as is?
http://docs.simplemachines.org/index.php?board=3.0;sort=subject