Which Version of PTE are you using & are you Windows or Mac?
Where are you trying to save it to? If a Flash Drive make sure it is big enough.
Better to save to your computer Hard Drive first & then copy to the Flash drive afterwards.
Make sure you are not trying to save to a drive that is not connected, such as external or Cloud storage.
Other than that I am not sure why it would stay at 0%
Jill