Keep in mind Youtube downloader often have malware. finds plenty of prior discussions but since you have a Youtube downloader I fear there is something extra in the machine.

Try Grif's advice since scans will take some time. Use that time to read other complaints about that error code.

Here's Grif ->;msg5099421

And you bring up a great question such as, isn't it about time Microsoft fix these update errors? It's just a download of a bunch of bits. So what if the internet drops out. Pick up where you left off (that's to MSFT, not you.)