Unable to get usable firmware update file -- R7960P

[BBerkov]

I've tried to find a way to update the firmware on my router.   When I download the zip file, it contains a file with a .chk extension (file fragment? even though file downloaded fully).  If I start the update when logged on to the router, it starts a process to update the GUI which seems to hang up or go into a loop.

Any suggestions?

[plemans]

did you extract the file? 
Always have to ask.