https://www.pcgamer.com/microsoft-thinks-it-fixed-the-file-deletion-bug-in-the-october-update-for-windows-10/

After pausing the October update for Windows 10 to investigate reports of missing files from some users who upgraded their PCs, Microsoft believes it has found and fixed the problem. You still can't download it though, not unless you're a member of Microsoft Windows Insider program.

"Today we take the next step towards the re-release of the Windows 10 October 2018 Update by providing the updated version to our Windows Insider community.  We will carefully study the results, feedback, and diagnostic data from our Insiders before taking additional steps towards re-releasing more broadly," Microsoft stated in a blog post.