Don't buy Corel products if you hate pop up ads
I bought a Humble Bundle deal that had Corel Painter Essentials and Aftershot, installed them and started getting popup ads. These popup ads appear outside of the app even when you are not running Corel apps. Apparently this has been going on for many years even if you paid full price for their products. So to stop getting ad popups, I uninstalled them. Alternatively you can disable or delete any item that has Corel from Task scheduler in Windows to remove the popup ads.
Reference (Facebook post): https://www.facebook.com/corelpainter/posts/10154631865189283?comment_id=10155962484579283&comment_tracking=%7B%22tn%22%3A%22R9%22%7D