Finally got it working. The way I was doing it before was download the zip file to my PC, extract the two separate cab files and email them to myself. But it seems that the files were corrupt when i did that. So i installed Total Commander, downloaded the zip file and extracted the cab files directly on the i760 and then was able to install the threaded SMS app. Surprised what i was doing before didn't work since i've done this in the past with other apps.