Just purchased from Steam a couple of days ago and it has never launched. At first it would bring up a dialog box for feedback to Stardock, but it quit doing that after the first day.
Please make sure you did not click to have it not show again:
If it then shows, please submit it with a valid email address.
If it fails, report back if you have this directory here:
If you do not, please ensure you do not have Windows Controlled Folder Access on:
Stardock Product Lifecycle Manager