60 day evaluation license and the free license are two different things -
The 60 day evaulation is just that - gives you access to all features of vSphere - ESXi and vCenter - but the information you recieved is incorrect on how the evaluation license works - it is valid for 60 days only and to reactivate you will have to reinstall the environment from scratch
The free license - is fully functioning ESXi license with limitations applied - including the inability to us HA, vMotion and cannot be managed by a vCenter server
So if you want HA and vMotion to work with out having to rebuild your environment every 60 days you will need to be licenses for your ESXi hosts -