Hi,
I did some research and found this:
https://learn.microsoft.com/en-us/windows-server/upgrade/upgrade-2012-to-2016
Based on my understanding,there could be errors when you install the original OS,thus, to do an in-place upgrade,I would suggest that you make backups for your machine in case of unexpected errors. Apart from that,it should be fine.
Thanks for your understanding.
Best Regards,
Danny
-----------------------------
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.