Welcome to the forum, Christoph and the world of Scaler.
Scaler and M1 do not quite get along on all systems. This is a known issue, has been worked on but is still not perfect. One thing you can try is running Scaler under rosetta as it seems to help some people. Also disable Open GL for Scaler as that is an issue on some systems. A quick search will show that.
To update just login to your plug-in boutique account and under the Scaler download will show the various versions. If you don’t see it right away just click on the version number to see the list.
