Can you provide any details on what version 5.6 isn't doing properly for you (that is working with version 5.2)?
Be advised that version 5.7 is now available, which might have already resolved the issue (but I can't verify this without details about what error you are experiencing).
Your license key will work with any 5.x version, you are free to install the 5.2 version your co-worker has (to downgrade you will need to first uninstall version 5.6).
Note: You can simply install version 5.7 over 5.6 to upgrade (without uninstalling first). See
http://www.kinook.com/Forum/showthre...&threadid=853.