If something breaks, the official forums can actually help you. Minimum System Requirements
Once you click into the course, there will be a link to "Download and Install Cisco Packet Tracer."
Unofficial versions often crash when you’re halfway through a complex network topology.
Run the installer. When you open the program, it will ask you to log in once with the account you just created. Key Features of the Latest Version
Windows 10/11, macOS 10.14 or newer, or Ubuntu 22.04 LTS. RAM: 4GB (8GB recommended). Disk Space: About 1.4GB of free space.