Premiere Elements 2020 not opening on Mac

[Karsten5FB1]

I downloaded and installed Premiere Elements 2020 on my MacBook Pro (2016), OS V. 11.1, Big Sur, today. The Homescreen opens to launch the Organizer, Photoeditor and Videoeditor. When opening the Videoeditor (Premiere) a loading messages comes up for a while but the Videoeditor/Premiere never opens. (It works for the Photoeditor/Photoshop).

Please help