Here are my findings on a Team Viewer remote upgrade of PC from Windows 7 to Windows 10 with out anyone at the remote site needing to do anything but leave the keyboard and mouse alone.
In the past I have had mixed results when trying to install Microsoft updates or upgrades. Quite often I would get kicked out of Team Viewer as part of an update only to find out that the remote device was stuck at a screen asking for someone to physically hit the enter key or click the mouse somewhere before it would resume rebooting and then allow Team Viewer to reconnect to the remote site.
This would necessitate an on-site visit or phone call to the site to have someone "fix" the upgrade.
Tonight I was able to take a remote PC running Windows 7 and Team Viewer and remotely upgrade the PC to Windows 10.
Before continuing let me say that the remote PC had already passed the preliminary Microsoft vetting which claimed the PC "approved" for a W10 upgrade. I had also set up the Team Viewer to allow Unattended Remote Access. Team Viewer by default has this option disabled, which makes someone have to read off the random Remote ID and Password to me after after the reboot. I tested the Team Viewer prior to doing the W10 upgrade by rebooting the remote PC and made sure I could log back into it after the reboot finished.
To start with I went to this link; https://www.microsoft.com/en-us/software-download/windows10 and downloaded the appropriate MediaCreationTool from Microsoft directly to the remote site, 32-bit or 64-bit since the PC had not been granted the W10 upgrade download yet.
Since the remote site was using W7 Pro I requested the W10 Pro be installed, since the have to match. Since there was no need to make an ISO or USB version since this was a remote site with a single PC needing upgraded I told the program to install directly using the files it would download.
Once the download was finished the install began and then came the first reboot. After being kicked out of the remote PC I waited a little over 2 hours for it to complete the first install pass and finally finish the reboot. After that Team Viewer let me log back into the remote site and resume answering the upgrade questions.
A few reboots later (of normal duration) and the upgrade finally finished.
Total time for this rather slow PC to do the complete upgrade from start to finish took approximately 5 hours. With a faster remote PC as well as a fast remote internet connection and your upgrade should take less time.
I'm not saying everyone will be successful when upgrading a remote site using Team Viewer but at least based on my experience you have a good chance. Again that is based on the remote PC being Windows 10 ready. The upgrade did not drop the Team Viewer connection with out allowing it to connect again during each part that required a reboot which meant no one had to be at the remote PC during the upgrade.
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