Export Sharepoint Designer Workflow

Question

Hi,

 

I need to export a sharepoint designer workflow. The option for "Export to Visio" in the designer is greyed out. I am using Sharepoint Designer 2013. The designer workflow is attached to a list in Sharepoint Online. I want to export this workflow and import this workflow on another machine such that it shows up in the designer on that machine. How can i enable this option? Is there any other way to export the designer workflow?

 

Please advice..