Palm avast is not very advanced in terms of updating :-\ (in contrary to the Windows CE version, which has a very good updater). Simply said, it doesn’t have any direct support for updating. To install an update, you have to download it from our web server to your PC, and install it using HotSync… Sorry. We might add an auto-updater to a future version, but it’s not available at the moment.
Tungsten T3 – I believe it should work, but the best is to try it yourself – download the trial version from http://www.avast.com/i_idt_1432.html .