OK, thanks for the detail re your model, it is one of the new CANDiag models, the GS911 WiFi is compatible with MAC/iPhone as the interface is a web interface with maintenance functions via cloud when using the iPhone so as much as you may wish to claim it is not compatible, it is. You dont even need to use the "App" to access the GS911 web interface and there are many people out there happily using the unit with their iPhones
Running parallels and any version of windows from WinXP up to be able to use the PC application is a good move for home base, XP would be my choice, WIn10 is too problematic and has too much telemetry back to M$
You dont give any info re the mode you are trying to use the WiFi with the iPhone, are you using off line Adhoc on the WiFi unit or have you activated a hot spot on the iPhone and getting the WiFi connect to it ?