Mentalmeisters are the people who are currently behind the Mental Omega game project.
If your updater in the Client doesn't want to complete the update or you were never able to start it at all, download this and extract to where your Mental Omega 3.3 installation is.
Full patch 3.3.4 changelog available at Mentalomega.com
Extract all the files to where your Mental Omega 3.3 is and overwrite everything.
You don't need to apply previous patches first, you can update from 3.3.0 to 3.3.4.