I am still on WIN 10 Pro 1709. I have followed the advice here and am always at least one version behind. With the forthcoming release of 1809 I downloaded the ISO for 1803 on 09/28/18, to install later, before it was replaced with 1809. Is that 1803 version free from the “lost files” problem, i.e. did it affect 1809 only, or did it affect both?
I seem to recall reading that it was affecting both versions. (My C: drive [250 Gb SSD] is reserved exclusively for OS and other installed programs. All data, photos, etc. on D: HDD.) So what I really am asking, I guess, is if they “updated” 1803 into the same problem, since there had been no such issue up until now with 1803.