During upgrade I set "Default Values" for selection based on the previous installation. If the user want to unselect all of the choices, how to set it?
ENTER A COMMA-SEPARATED LIST OF NUMBERS REPRESENTING THE DESIRED CHOICES, OR PRESS TO ACCEPT THE DEFAULT:
In this case, the DEFAULT is "1,3". Entering other number such as 0 is not allowed. I think the "," works but I would like to know the right/better way.
I think that I've encountered the exact same issue some years ago when implementing the console mode for our installer... and the only workaround I could come with was to present the user with all choices unselected (but I guess that in your case, and most likely in mine, too, it is mandatory to test that the end user made selected at least 1 choice).
