Hi,
is it possible to upgrade from 6.4.x zo 6.5.x with an older Enterprise pre-6.5.0 license or do I need to get an no-enforcement license first?
Upgrade first, then install the new license key:
http://docs.splunk.com/Documentation/Splunk/6.5.1/Installation/HowtoupgradeSplunk#Get_and_install_th...
The new license type is not recognized on pre-6.5.0 Enterprise versions.
The question was more like if the old license can be used with 6.5.x onwards?