Do not update to High Sierra

[DJP13]

Showxpress does not open with High Sierra version 10.13 and 10.13.1. It will crash every single time you open showxpress.

We had a show on a previous computer with Sierra, updated to High Sierra and now showxpress crashes. The ONLY difference is the macOS.

There is some bug within macOS that is preventing the opening of the application

[support]

Feedback from other "High Sierra" users are welcome.