Sometimes it may be faster to launch and update JoinMe as the currently-logged-in user rather than logging out as that user and logging back in as an administrator.  In those cases you can follow these instructions to launch and update JoinMe as a privileged user without logging out as the current user.

• Open a Terminal
• Switch user to root (su root); you may have to su to administrator first
• Launch JoinMe: /Applications/join.me.app/Contents/MacOS/join.me
• JoinMe will launch and update successfully, then you should close JoinMe
• Now you may launch JoinMe from the Dock as the user
• Remember to exit out of your changed user session in the Terminal (and close the Terminal if appropriate)

(This is important only only on a Mac.  Windows doesn’t require elevation to run this update.)

That’s it.