In the mean time you could try to work around it by installing via

msiexec.exe /i RancherDesktop.msi WSLKERNELINSTALLED=1

. This should make sure the installer doesn't install the WSL kernel, so the Powershell script should not be executed. This is just an idea and has not been verified though.

This worked fine for me in our enterprise restricted environment. Thank you very much. I'll now looking at the proxy settings and try to configure to use a private registry (nexus as proxy for docker registries).