Well, if your licence has expired, and the owners don't want to sell you a new one, you're SOL. I know, it sucks. Remember this next time someone offers you software-as-a-service.

In the meantime, if the only thing that covers your needs is wayfinder, one solution might be to buy a 770 or N800 navigation kit (Amazon have a couple right now), and use that licence on your N810. You'll also get a very decent BT GPS and a few other bits and pieces in the bargain.