Your right, the link doesn't work anymore. The last message in the 302 firmware thread states that the final version is out, so I checked the ukranian site.
Eventhough I don't understand the ukranian language, I found the correct link by clicking around:
then click on the 15.4, it has the exact same name as the one I got from the forum. Unfortunately, they differ at binary level. Nom I'm uncertain if this is the latest file or not.
I haven't run into problems yet with the latest alpha, and am using it happily. The navigation keys are working just as I mapped them. I have no real complaints other than I'd rather have a Pearl screen. The 302, built as a tank, will last me forever I'm afraid.
Plus there was one 'scary' moment, I had to redo the update. After a reset it updated fine, without problems.