VirtualBox Error During Sage Installation

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Hello,

I am brand-new to Sage.

I'm running Windows 7, 64-bit OS. I downloaded Sage from here: http://mirrors-usa.go-parts.com/sage/... and downloaded VirtualBox. When I try to open Sage with VirtualBox, I get the following error message:

Failed to import appliance C:/Users/mcdonope/Desktop/sage-6.4.1.ova.

Could not create the imported medium 'C:\Users\mcdonope\VirtualBox VMs\Sage-6.4.1\sage-6.4.1-disk1.vmdk'.

VMDK: Compressed image is corrupted 'C:\Users\mcdonope\sage-6.4.1-disk1.vmdk' (VERR_ZIP_CORRUPTED).

Details Result Code: VBOX_E_FILE_ERROR (0x80BB0004) Component: Appliance Interface: IAppliance {3059cf9e-25c7-4f0b-9fa5-3c42e441670b}

What am I doing wrong? Any advice is greatly appreciated!

Tricia