If the Health Check app tells you that your PC can’t run Windows 11, that might not be the end of the story. Depending on your exact setup, it may be possible to enable Secure Boot and TPM in your system BIOS, which will then allow Windows 11 to be installed and to run.
I do wonder, though, whether you might have got the wrong end of the stick when talking to our support team. I’ve never heard of our support team telling people that they can’t provide support because of hardware (except perhaps to those intrepid/foolhardy people in the “Hackintosh” community who try to run macOS on unsupported hardware). However, we will shortly be ending support for Cubase 11, as per this announcement:
So I wonder whether perhaps that’s what they meant?