It sounds fishy to me... for one, you can freely download the tarball of VMware by registering and just downloading it. If you enter a trial key, you are restricted to the 30 days. If you enter a purchased key, you are not restricted in use. (I do not know if other keys exist, but it's likely that ff they do, the same binaries operate accordingly).
Plus, are you even authorised to do this or are these illegit keys? I'd watch out about this too, since you do not have a vmware.com email address.