Problem installing Ekos - by: grantboxer

Hi All,
I am trying to install the INDI program to drive my astro gear and have been unable to install the Ekos pgm under the VM.
I am running Win7 64-bit on a laptop. I have enabled hardware virtualisation and installed Oracle Virtual Machine. When I try to add appliance, the program starts to install but fails near the end with the message " Failed to import appliance C:\..."
Error message is as follows;

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Failed to import appliance C:\Users\Grant\Downloads\ekos.ova.

Could not create the imported medium 'C:\Users\Grant\VirtualBox VMs\Ekos\Ekos-disk1.vmdk'.

VMDK: Compressed image is corrupted 'C:\Users\Grant\Ekos-disk1.vmdk' (VERR_ZIP_CORRUPTED).

Result Code: VBOX_E_FILE_ERROR (0x80BB0004)
Component: ApplianceWrap
Interface: IAppliance {8398f026-4add-4474-5bc3-2f9f2140b23e}

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Any suggestions about what I am doing wrong? I have tried downloading the file again but I get the same problem.

Cheers Grant