You can download the full version of Packet Tracer 8.x (and the newer version 9.0) without paying a fee.
Downloading a "crack" for a free program is a significant security risk. What is Cisco Packet Tracer? | Free Training and Download download packet tracer 8 full crack
Historically, Packet Tracer required a paid Cisco Networking Academy enrollment. However, Cisco has made the software free for everyone. You can download the full version of Packet Tracer 8