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Navigate to Edit -> Preferences -> IOS Routers and click New .
Version 12.4(25d) was released in the late 2000s. While newer 15.x trains exist, 12.4 remains the before the introduction of "IOS 15" licensing changes (Universal images and Right-To-Use licenses). Many engineers prefer 12.4 for emulation because it is feature-complete, stable, and less restrictive. c3745-adventerprisek9-mz.124-25d.bin