The “new” mini was cloned from a CCC backup (10.12.3) of the old one. All is well but slow. Now I can deal with the old Mac mini. OWC offers a turnkey update service. $79 which includes shipping both ways and installation of hardware. I like that price for service. I ordered a 480 GB SSD and a 2TB spinning drive to be placed in the mini. They did the task well, timely enough, and even replaced the OWC memory that was in it. Apparently it failed testing so they did the lifetime warranty replacement while it was there.