From Convention Master Documentation
Before starting an upgrade, we recommend that you backup your Convention Master database and files.
To perform the upgrade, run a Subversion update in the folder that contains your Convention Master installation:
$ svn up /path/to/convention_master
When this has completed, log in to the staff console [yoursite.com/console] with an account that has the "Perform DB and System Upgrades" permission to automatically trigger any pending schema updates. DO NOT FORGET THIS STEP, otherwise it will leave your install in a locked upgrade state.
For fuller/more complete information on upgrading your Convention Master installation, please see our upgrade documentation.
If you have any questions or comments, please email us at firstname.lastname@example.org.