Having Issues downloading plugin

I am currently running Rhino 6 on my Mac through Parallels and I am trying to download a plugin but keep getting this error code. Screen Shot 2020-07-31 at 12.43.54 PM

Let me know if anybody has gotten this! Any help is appreciated.

Put the .gha file in the gh libaries folder instead of opening it in Rhino mabye?

It worked! thank you!