While setting Trickster to "Launch automatically on Login" in Trickster's own preferences usually works, there's another way to make Trickster to launch on system startup and that's by manually adding it to Login Items in the System Preferences for the user. Here are the steps and the video walkthrough:
1. Find Trickster in Finder (should be in Applications folder, or in Setapp folder)
2. Open System Preferences
3. Click on Users & Groups icon
4. Click on Login Items tab
5. Drag Trickster icon from Finder onto the list
6. Optionally click on Hide checkbox on Trickster's row