Originally Posted by Jason Robitaille:
inside the Zip File is a jar. I suspect you're trying to open the jar and that's giving you the error. Inside the zip is a ReadMe.html (basically describes my above post) and WebOSQuickInstall.jar (the app)
EDIT: thanks to Dieter for adding .jar upload support, uploading the the unzipped jar file now
EDIT2: uploaded to first post 
Thanks! Works fine now. Great work.
I have a question, does this program also installs the "rooting requiered" apps??