Can I upgrade from version 1709 to 1809 using an ISO file?

[Amelia43]

Attempts to upgrade from Windows 1709 to 1803 have failed over the past few months. The installation seems to go through the usual processes then on the final restart - failure. Various error messages, the latest being 0xc1900101.
In desperation I thought I might try using the Media Creation Tool.
The 1803 ISO is no longer available, so I would have to skip a major update, but I was wondering whether I should try upgrading directly to 1809 using the available ISO file. Is it possible and safe to try this?
Many thanks in anticipation of your wise and experienced advice!

[HansV]

Yes, you can upgrade from 1709 (from any earlier version of Window 10, in fact) to 1809 using the Media Creation Tool. The ISO file contains a complete installation of Window 10.

Although it should work without problems, I'd make a backup of your important data first, to be on the safe side. This is always a good idea before a major update.

[StuartR]

Although it should work without problems, I'd make a backup of your important data first, to be on the safe side. This is always a good idea before a major update.

This is ALWAYS a good idea, even if you aren't planning a major update!

[HansV]

Yes, of course.

[Amelia43]

Thank you both.
I have complete (and continuous) data backups, and twice weekly images. I'll take the plunge!