I tried right click and save as zip, as well as right click and save as 123.xxx.
Both had the same result.
When doing the upgrade it fails at different parts .. sometimes 2%, 15%, and I event got to 55% once.
So I do not think it is related to the file extension.
I also tried to apply 2.8.16, but that failed.
I think I upgraded to Windows 7 on all my machines since I last upgraded the ISY.
Is there something specific about Win 7 ... some service I should stop?