Grasshopper installation

I try to install grasshopper, but I get this message again and again. I’ve just downloaded new Rhino (trial) and Grasshopper from the Rhino website. Any ideas?

@brian, I forwarded this user from Grasshopper Ning, can you help out?

Hi, this problem means that the RHI file is corrupt. Please delete it and download again.

Thank you! It works now!