You show TetherBerry.dmg
My Add/ applications using the PC Desktop manager shows "(*.ali | *.alx?) - not .dmg for sure.
When I download the .DMG using the phone itself - it just "prints the hex" onto the screen as garbage - It doesn't recognize this extension for sure.
OS 4.5 - CURVE 8330 / CDMA
I have exactly the same problem with my Curve 8310 and Desktop Manager. I cannot install the .jad application.
The same day as my post to the Forum, Tetherberry emailed me a link to a file that my Curve 8310 would recognize and install. The subsequent service works very well. I consider this excellent customer service.
Crap - I meant '.jad'
None the less - it don't like it at all.
It wants "*.alx" or "*.ali" - not jad.