Sometimes Windows 10 updates breaks Windows and it can do things like not allow other updates to finish or outright just completely break Windows and you are only left with doing a re-install.
I had issues with my daughter's laptop, after an update took place, any other update after it would fail to download and install. I rolled back the system to fix it....then the updates happened again and any update after it would fail. I just ended up doing a clean install of Windows 10 and after that all updates worked fine.
You could try doing a sfc /scannow to see if it fixes any windows system file issues.
You can try to do a system restore before the last update, see if that fixes your issue and allows updates to continue without failing.
You can try finding the specific update you need and download it from Microsoft and manually install it (just make sure you download the correct version for your computer)
Sometimes if all else fails you just have to re-install Windows 10.