Mac Sierra 10.12 Disable App Translocation
This applies to Mac OS 10.12 and any MXWendler version
You start Stage Designer, and a warning appears that a certain folder could not be created due to a read-only filesystem path.
Under OSX Sierra, Gatekeeper dislocates unsigned applications to random paths on start.
1. Disable Gatekeeper.
2. Open Terminal as Administrator.
sudo spctl --master-disable
4. Reinstall Stage Designer.
5. This may affect your security settings.
Long Term Solution
Switch from OSX to a real operating system.
For more information, please see e.g. https://www.tekrevue.com/tip/gatekeeper-macos-sierra/