Here try this link, might be easier to download off of, I've always hated mediafire.
zSHARE - Sherpa.apk
Once you download it, transfer it to your droid, you can leave it on the top level or create a folder. Use Astro or another file manager to open the file and it should come up with wanting to use the appmanager, from there you can install it.
__________________
Resistance is futile. 
On 11/14/2009 DroidNet Calls People Randomly
On 11/15/2009 DroidNet Txts People Randomly

On 11/16/2009 DroidNet Became Aware