It sounds like you’re trying to download a specific Cisco IOS image: .
Using an adventerprisek9 tier image at version 15.9(3)M6 provides an edge over older or lighter IOS images: viosadventerprisek9mspa1593m6qcow2 download better
mkdir /opt/unetlab/addons/qemu/vios-adventerprisek9-m.SPA.159-3.M6 It sounds like you’re trying to download a