Updating your Creo application should be automatic! Every time the CadActive application loads, it will search for a new version, and update as-needed.
If this does not happen automatically for some reason, or if you would like to check for an update mid-session, you can also manually update the application.
First, send an email to firstname.lastname@example.org asking for the latest Creo application code.
Once you have received the latest code, take the contents of that zip (the "bin", "text", directories, etc)
And overwrite the contents in your localappdata directory (%localappdata%\CadActive\