I emailed Umax again asking if they are still working on OS X drivers for my Astra 6400 scanner. Today I got the following back:
Well, at least they admit to still working on them!From Umax Technical Support [email@example.com]
9.2, 9.2.1, 9.2.2 and OS X drivers are currently under development. No release date has been set for these drivers. As soon as the drivers are released, they will be on our web site for a free download.
We are very sorry for the delay.
If you have any other questions, you may contact technical support at 214-739-1915.