I already had a working Qt 5.5 installation in /Applications/Qt that has working Mac desktop, ios xcode and android kits.
I installed the vplay sdk, which created a 2nd Qt install in /Users/myname/FelgoSDK. This 2nd Qt installation can ONLY create mac desktop apps.
Since most users will want ios and android kits, you should update your install docs.
Instead if you have an existing Qt install, delete the unnecessary /Users/myname/FelgoSDK install. Use /Applications/Qt/MaintenanceTool to add the user repository https://sdk.felgo.com/2/macx which installs the vplay examples and files. Open the vplay examples in /Applications/Qt/Examples/Felgo and run on desktop, ios or android 🙂