Actually I tried the early access version, not the demo.
Do your System fits the System requirements:
Windows 64 bit or Linux 64 bit (Tested with Ubuntu 22.04 LTS) Min. 8 GB RAM Dedicated Graphics Card with OpenGl 3.3 or later Support Microsoft .NET Framework 4.7.2 or later CPU with min. 4 Cores / 4 Threads?
For me important is especially the Dedicated Graphics Card.