Hi. I know it's been said already, but I'm having this updating problem too:
2019-07 Cumulative Update for Windows 10 Version 1903 for x64-based Systems (KB4507453) -Error 0x800f081f
I've tried googling the code and followed every suggestion (NET framework, etc) to try and resolve it with no success.
I've been reading around that the problem could be related to Microsoft Edge being unavailable, or some tweaks being made after installing the system.
After installing this OS, I remember making various tweaks with the WinAero that comes preinstalled right after installing the OS and BEFORE trying to run windows update. So I got this error everytime after that and I haven't got the time to make a fresh install of the OS again and try to run windows update BEFORE making any modifications.
So, for those who do have this problem and the ones that don't, did you try to run updates right after a fresh install or did you make any modifications before?
The other thing I tried was attempting to reinstall Edge but I don't think it's possible, or at least I couldn't in any way.
Sorry for the long post. I love this version, Mirkec, congrats on the great work and hope we find a solution to this issue. Maybe find the way to reinstall Edge if that proves to be the problem.
Have a great day.