I am just going to put this back out there and then hopefully remove myself from this thread. 

I worked with QB directly to set up multi-user, going from  1 license to 2 license remotely via WiFi,  using on 1pc as the host/workstation.  QB Support said it could be done. I told them in "no uncertain terms" if it could not be done do not remote in and assist with the change.  I was told again by the 2 QB Phillipino agents it was no problem to do and it would work just fine  QB Support  remoted in and then proceeded to change to mulit-user access and screwed up the computer that was to be the host/workstation and my QB File and computer was no longer accessible. (Thank GOODNESS, I was smart enough to have a full computer back up and QB Backup before all this started. )  After approximately 22hrs consecutive hours, 5 agents later,  I was told that my IT dept would have to fix and QB was not responsible for their screwing up my computer and wasting all my time.  I am a "Mom & Pop" small business. 2 computers, just me and my husband.   I do not have an "IT DEPT." which I told the QB support agents numerous times before we started and caused the whole fiasco.   Needless, to say,  I do not recommend trying to upgrade to 2 users and do this over WiFi connection.  Spend the money to hard wire network, have a server host.  Lesson learned the hard way.   Again, Intuit,  never took any responsibility for the problem they caused.