Tried my first Quick Migration and have an issue. Have purchased VMware's Server Essentials Kit (3 servers, 2 processors each). Migrating from one ESXi 4.1 host to a new ESXi 6.5 host, so within the licensing limits for Server Essentials Kit. The ESXi 4.1 host has a free version of vSphere. So when I tried a Quick Migration from it, it failed saying that the source host wasn't licensed. Any suggestions on how to apply the Server Essentials Kit license to the 4.1 host to change it's license from the free version to the Essentials Kit license? I've tried applying the Essentials Kit's license key, but it comes back as an invalid key.
Any other suggestions? I realize that the VMware Standalone Converter would work, but was wanting to not have too much downtime to migrate the VM's. There's 3 VM's I need to migrate. 2 I could go the Standalone Converter route, but the 3th is a domain controller that I wouldn't want down for more than a few minutes.