How to implement "Can't run the channel" message when no internet available

Hi JalpaWhiz .  You can check the internet status flag in the device info object.  This will be true when the device is connected.  If the flag is false, they you can pop a dialog stating the the channel can't run.

https://developer.roku.com/docs/references/brightscript/interfaces/ifdeviceinfo.md#getinternetstatus-as-boolean  

Note that if you want to monitor for the internet status event, then you'll need to enable it:

https://developer.roku.com/docs/references/brightscript/interfaces/ifdeviceinfo.md#enableinternetstatuseventenable-as-boolean-as-boolean

JalpaWhiz, that message isn't exactly the same thing as what you're looking for.  That message implies the channel package is no longer cached on the device and must be reinstalled from Roku's server.