Reinstalling the newest update has fixed the licence key issue for several others so far.

You're welcome :)

That should have been 12 ft radius, not diameter ;)

You will need to fiddle with the settings quite a lot, but at least you have some kind of starting point to work from.

Pure gradients (setting up a fill in a polygon that shades from one colour to another straight across, radially, conically, etc) aren't currently possible in CC3, but you can use a large Bevel, Lighted effect on the crater sheet in combination with a crater shaped polygon of a solid colour, followed by a Blend Mode sheet effect set to overlay.

You will need to edit the effects and play with all the settings to get it just right for your particular map. These are the ones I used on a plain white circle of about 12 feet in diameter, though you can use any shape or size you like.

Its a lovely map. Amazing what a difference a change of colour makes, isn't it :)

Looks like you've nearly finished it :)