After battling for days trying to install Windows 10 AU on my Vbox Windows 10 Guest I ended up with an unbootable machine and no where to go!
To solve the problem and to at least get back my activated copy the following worked for me:
- Download the latest Windows 10 AU update ISO from Microsoft
- In Vbox Manager Settings > Storage add downloaded ISO as an optical drive
- In Vbox Manager Settings > General >