Upgrading Server license to a Site license

I should be interested to know if it possible to upgrade from a single server license to a site license by paying the difference.

It is possible. Details have been sent to you in a private support ticket.

Thanks,

I should also like to know how to transfer a server license from one machine to another. Do I simply run the activator again on the replacement machine?

If you have a site license you can activate additional servers when necessary.

A single server license is for one activation of one machine and is non transferable.