Last month I did a blogpost on Usage of Microsoft Office 2016 KMS Host or ADBA License Pack. This time I want to show you what's needed to update existing KMS hosts for Windows 10 activation.
When KMS is installed on Windows Server 2008 R2 a hotfix is needed. It can be found here: Microsoft
After that a special key is needed. It's called Windows Srv 2012R2 DataCtr/Std KMS for Windows 10. You can find it on the following location:
On the Volume License Servicing Center go to Licenses > Relationship Summary, instead of going to 'Downloads and Keys' where you can find it normally. Navigate to the License ID and open the details of it, then select Product Keys. In that you find the key needed for Windows 10 activation mentioned earlier.
Just use the commands Slmgr -ipk <product key> and Slmgr -ato on your KMS host to update it for Windows 10 activation, and you will be fine! This also on Windows Server 2008 R2 :-)
Activating Windows 10 on Windows Server 2008 R2, Windows Server 2012 and 2012 R2 KMS hosts
Windows 10 KMS Requirements (outdated)
Find and Update Your KMS Service Host Key To Activate Windows 10