I've been reading about this upcoming October update to W10. It won't be especially huge, just the same, 10 or so Gigs might give someone a problem of an incomplete download.
This is a very useful tool for the upcoming W10 October update. You may need this if the above occurs: Windows will not tell you this is happening and Windows might get borked. (https://download.cnet.com/blog/download-blog/microsoft-warns-windows-10-users-to-free-up-storage-space-for-the-big-october-update/?tag=nl.e785&s_cid=e785&ttag=e785&ftag=TRE410dd70).
Make sure you know how to reinstall Windows, and make a disk image BEFORE the update on an external storage device. Use Acronis to clone your disc, and clone your disc before any big update.
Doing this also mitigates any ransomware infection.
https://www.microsoft.com/en-us/software-download/windows10
This link also will allow you to download the October update early, although I really wouldn't advise doing so.
MS will start rolling out the update on October 9th.
So what will be in the update How to Geek gives a summary here: https://www.howtogeek.com/353165/whats-new-in-windows-10s-redstone-5-update-available-fall-2018/
UPDATE:
W10 Update hit by second file deletion bug:
www.infopackets.com/news/10434/windows-10-hit-second-file-deletion-bug