I'd like to remember you I downloaded Hp customized ISO of ESXi 5.1 U1 and I installed it, then I got vSphere 5.1 by https://<hostname of me ESXi host> by click on "download vsphere client" and I installed it on my pc.
When I run vSphere client I clicked on "help", "vmware on the web", "register now"... I.E. is opened at https://www.vmware.com/account/secure/productRegistration.do and I typed "the license key" which I found according to the following steps:
I tried to open this link "https://www.vmware.com/go/get-free-esxi, which a.p. has indicated, page is redirect to https://my.vmware.com/group/vmware/evalcenter?p=free-esxi5&lp=default
Then I recreated new VMware account on myvmware and I can see in 'License Information' section the license key.
Perhaps I have to download vSphere 5.1 from vmware site? I want to say the same site where I retrieved license key.
PS
I attached evaluation message from vsphere client
