i have a macbook pro with a intel iris plus graphics 655, catalina OS and C4D r23. Is it possible to to run? Because atm im getting the error message "there is no GPU device witch is selected..."

Is OctaneRender Cinema4D still not supported on macOS Monterey with Intel Iris 655 GPU? I would be ...

I think the Intel Iris 655(GT3e) GPU is not currently supported by Octane X. You will need to use an eGPU box with an AMD Radeon VII or 5700XT GPU in order to use Octane X.