: This is the specific software release. The 15.9(3)M train is one of the most stable and feature-rich releases for virtual labs.
If you are setting up a virtual lab, please share the you are using (like EVE-NG, GNS3, or CML) so we can look at the exact directory structure or template requirements needed for your deployment. Share public link download viosadventerprisek9mspa1593m6qcow2 verified
viosadventerprisek9-ms.vmdk.SPA.159-3.M6.qcow2 is a virtual disk image for the Cisco IOSv (Virtual IOS) : This is the specific software release