Hi, you can download it from the GNS3 website, here is the download section https://community.gns3.com/community/software/download
Under the appliance section click on the:
And this will download the OVA file that you can use to import into VMware vSphere or Workstation. I use VMware Workstation.
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vfk
Systems Manager / Technical Architect
VCP5-DCV, VCAP5-DCA, vExpert, ITILv3, CCNA, MCP