(formerly VIRL) is the most common legal way to access Cisco images like IOSv, IOSvL2, and ASAv.
Professional labs require dozens of images. A full library (e.g., vMX, vQFX, DC switches, firewalls) can exceed 200GB . Eve-ng Images Download
SSH into your EVE-NG server (running on Ubuntu) or use the web interface's built-in terminal. (formerly VIRL) is the most common legal way