So first you have to install hotfix https://support.microsoft.com/en-us/kb/3058168. If you try to install it on server, but receive an error, then first you have to install https://support.microsoft.com/en-us/kb/2919355, which consists of several updates and has one more prerequisite update https://support.microsoft.com/en-us/kb/2919442.
So the update install order should be like this:
1. Install KB2919442
2. Run clearcompressionflag.exe from KB2919355
3. Install KB2919355
4. Install KB2932046
5. Install KB2959977
6. Install KB2937592
7. Install KB2938439
8. Install KB2934018
9. Restart the server
10. Install KB3058168
Once you have installed all updates, you have to find correct KMS key. If you will use Windows 10 KMS key then you will not be able to install it onto KMS server and you will receive error 0xC004F015, as described here https://support.microsoft.com/en-us/kb/3086418
You will have to find Windows Srv 2012R2 DataCtr/Std KMS for Windows 10 in the VLSC portal. Once you install it on KMS server, Windows 10 computers will be able to activate!