Teclast have posted on their Weibo today, that the X98 Air 3G can update to the official Windows 10 release out today. (I’m updating mine now to test it out) According to Teclast, it’s working just fine, only one issue with an unknown device in the device manager. But they have released their X98 Air 3G C5JX Windows 10 drivers pack to fix this:
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Other models like the Air two to follow. And this driver update here might work on other models if you are experiencing any unknown devices.
Edit: Now running Windows 10 on my X98 Air 3G, i had no driver issues or device manager unknown devices.
You can jump straight over to Windows 10 or by pointing your browser here: https://www.microsoft.com/en-us/software-download/windows10 on your tablet you want to upgrade.
Upgrading your X98 Air 3G? Please join us in the X98 Air 3G / Air II Windows 10 upgrade thread for more.
Source: Weibo / Teclast Forums (Chinese)