CAS version 9.8.7. (this is the latest and the last version, no other newer version has or will be made! soft and the CAS box have been discontinued since 2014) added for anyone who still needs it.
1) Install the software first, with the CAS box disconnected.
2) In widows 11 x64, during the CAS software installation, you will get a red flag popup that the driver is not digitally signed and if you still want to continue with installing it: choose to install it.