How to disable HDRI shadows?

[archz2]

I have applied an HDRI environment in my keyshot file. I also added a disc and applied a lighting material. However, I'm still getting a shadow in the wrong direction which is provided by the HDRI. Is there anyway to turn off the shadow off HDRI?

The ksp file can be downloaded from here.
https://icedrive.net/0/63MfKxgcbi