If you're in a void and can't get out, go to Help, and use the "Physically stuck in game" option to get relocated. Hopefully that will be enough.
As for UOAM, Bexlan stopped supporting it about 2-3 years ago, and it was only in the last 2-3 weeks that he actually took the site down to download it. It still works though (but for a few of the changes made since 2006, needs a slight hex edit), and there are some discussions on the U.Hall forum of people who can get you a copy of it (with the changes) if you need it.
The UOAM creator decided to "take his toy and go home", and wouldn't let Tugsoft, Stratics, or even EA Mythic (the branch now in charge of UO, since EA Origin division was closed 4 years ago) have the product to continue it - and won't even entertain offers to sell it.