Some Mac users have been experiencing issues with Sims 4 Tray Importer since upgrading to macOS Sierra.
For example:
-- The application "bounces" in the Dock and then disappears.
-- Mono Framework doesn't work.
-- The application cannot find The Sims 4 files.
This tutorial will show you how to install and run S4TI correctly.
1. Download the required files
Firstly, you need to download both Sims 4 Tray Importer and Mono Framework.
@deevo has uploaded an updated version of S4TI for Sierra HERE that includes a debug window