Convert 2012 R2 Server to Windows 10

I have a server, with standard office equipment that I got from my company. It is currently running Windows Server 2012 R2. The intention is to use it as a media server connected to a TV.
It works well, but the server operating system is very heavy and slow to start. Plus, it's not 100% compatible with some of the apps I want to run, so I'd like to install the Windows 10 standard on it.
Does anyone know if the server license will work under Windows 10 and which version of Windows 10 (home / professional / enterprise) can I install?