Your DVR+ (CM7500) will automatically update every 24 hours +~10 minutes. If you perform a 'Internet Channel Guide" update at 8:00 pm on Monday, it will update again at approximately 8:10 on Tuesday, 8:20 on Wednesday, 8:30 on Thursday, etc.
to see when your guide has last updated; Press Menu on the remote control. Select Settings>Technical Info>STB Health> now you can see "Last Internet Guide Update". It should update again in 24 hours + a few minutes.
This automatic update is only available if you keep your DVR+ connected to the internet, via WIFI adaptor or Ethernet cable.
To trigger a Program Guide update, press Menu on the remote control. Then select Settings>Channel Setup>Antenna Channels>Refresh Internet Guide Data.
You can find the Quick Start Guide and the complete User Guide here.