Open GNS3, navigate to , and select the downloaded template.
This specific version (15.6.2T) became a gold standard for labbing because it is stable, feature-rich, and runs reasonably well on consumer-grade hardware compared to newer, heavier IOS XE images. vios-adventerprisek9-m.vmdk.spa.156-2.t download
You cannot legally find this file on public file-hosting sites. To obtain it: Open GNS3, navigate to , and select the downloaded template