There are 2 files to install. If you are not reading this page from your device, go to http://oggsync.com/m on your mobile device.

If you click and download, but the install doesn't start, you may need to go to File Manger to find the .CAB file and click on it manually from your device.

1) .NET CF 2.0 SP2 INSTALL
If you are unsure, try this first one, it is likely the one you need:
WM5/WM6 Pocket PC & Smartphone
Pocket PC 2003 & Pocket PC 2003/SE

2) OGGSYNC INSTALL
OggSync Mobile 3.21