Go to Tools > Options > Television, and click Setup. Click OK without checking any checkboxes (unless you really want to reset your data). Next the setup wizard appears, and you should make sure you enter your postal code. I just tried. If I enter a Taipei postal code, 103 for example, the "Download EPG automatically (recommended)" option on the Guide Data Source page would be available. You could choose appropriate provider ("DVB-T數位電視頻道“ for example). Alternatively you can choose XMLTV option.
If you previously had EPG set up, it probably is just a matter of making sure MC periodically download the data. If that is case, you should be able to fix it by manually running "Load program guide..." tool once and set up the schedule.
Make sure you are using the latest build (84).