I recently tried to download the CAB file for the Winterface application. When it started to download all I got was a page of words and letters. Tried a couple of times. Help
For the support page for your device, go to palm.com, click on support, phones, select your model and carrier. This will take you to the main support page for your device.
Sometimes, that happens. The easiest way to deal with it is close your browser and use a file explorer app to browse to you browser's local cache. You'll find the .cab file hiding in there at which point you can move it or execute it.