Just bought the mega map pack since there were some really cool maps available and I thought i'd support the devs.
None of the new maps are appearing though! It still prompts me to buy the pack.. How to fix?

The Mega Map pack allows you to create games on all Warlight maps. There are just 2 possibilities:
1. The maps don't appear on the screen like a flashlight, you can now create games on them, so go there and make one and see if this works.
2. Wait a bit more for the Paypal to be confirmed and refreshed.

Good luck in your journey in this wonderful strategy game!

have you tryed cahnging the settings to all not recommened

Yeah, make sure that you are selecting all maps when you are creating a game.