On Mon, 02 Dec 2019 17:19:15 +1100, Lucifer wrote:

Is it possible to upgrade from a licensed version of Panasonic
(FZ-G1ASBJKBA) FZ-G1 ToughPad Core i5 (3437U)
OEM Windows 8.1 Pro?


See these very very recent articles
https://www.bleepingcomputer.com/news/microsoft/you-can-still-upgrade-to-windows-10-for-free-heres-how/
https://hothardware.com/news/microsoft-still-allows-free-windows-10-upgrades
https://www.cnet.com/how-to/upgrade-to-windows-10-free-heres-how/


Disclaimer: I have not tried these myself.