Lamina 7, windows 8.1, 16GB with 7 GB free (after 8.1 restore) on C: + 4 GB recovery partition
Upgrade to windows 10 Fall Creators (keep all settings option & do NOT look for updates before installing)
Used USB OTG hub with 1x USB stick with Fall Creators Update install 1x USB stick 32GB for temp storage.
Initially Creators Update complained, not enough storage, selected USB stick 32GB and install continued.
At around 70% install progress battery flat/died, recharged for an hour then rebooted and install continued in recovery mode and finished normally. Screen rotation works, no need to reinstall drivers.
Windows 10, free on C: 5 GB and some 6 GB taken by the windows old folder (before running windows update)
4Gb recovery partition is gone (selected no such option to delete it), space been added to C:
The 32 GB stick holds a win 8.1 recovery and all the 8.1 drivers!