Packet Tracer requires authentication with your login and password when you first use it and for each new OS login session. (1)

Considering to upgrade?
For CCNA 7, Packet Tracer 7.3.0 is the minimal version that supports CCNA 7.
For CCNA 6 (and older versions), we recommend instructors and students stay with Packet Tracer 7.2.2.
If you are learning/teaching both CCNA 6 and 7, please use Packet Tracer 7.3.0.
When using Packet Tracer 7.3.0 for CCNA 6, there is a small possibility you may encounter a warning message.
If so, you may disregard the message. It is simply a warning that scripts in this file need to be updated for Packet Tracer 7.3.0 compatibility.

Windows Desktop Version 7.3.0 English
64 Bit Download
32 Bit Download

Linux Desktop Version 7.3.0 English
64 Bit Download

macOS Version 7.3.0 English
Download

Mobile iOS Version 3.0 English
QR Code for Packet Tracer for iOSDownload

Packet Tracer for iOS on the App store

Android Version 3.0 English
QR Code for Packet Tracer for Android