Packet Tracer Version 5.3.3 Latest Version

Packet Tracer version 5.3.3 is a maintenance release that fixes functional and technical issues in the previous versions. It replaces Packet Tracer version 5.3.2.
Packet Tracer 5.3.3 supports activities authored in Packet Tracer 4.x, 5.0.x, 5.1.x, 5.2.x, and 5.3.x. Please note that the last two courses of the CCNA Discovery and CCNA Exploration curricula require Packet Tracer version 4.11 at a minimum, CCNA Security requires version 5.2 at a minimum, and the Packet Tracer Skills Based Assessments require version 5.3.2 at a minimum. The curricula are fully compatible with Packet Tracer 5.3.3.
You can download both the Packet Tracer application and tutorial files in one download package. However, due to the large file size it is faster to download the application by itself, if that is all you need. Choose the download option appropriate for your needs.
Windows:

Title Document Type Packet Tracer v5.3.3 Application + Tutorial This is the complete Packet Tracer program including tutorials as a single downloadable package for Windows 2000, XP and Vista. (EXE – 81 MB) Packet Tracer v5.3.3 Application only This option is just the Packet Tracer program and the help files for Windows 2000, XP and Vista. It does not include the tutorial files. The tutorial files are not necessary to run Packet Tracer. (EXE – 49 MB)

Linux:
Use Firefox to download the Linux.bin files as Internet Explorer doesn't load them correctly.
To install the Linux BIN packages, set the permission to be executable (chmod +x PacketTracer52_*.bin) then execute the binary in the terminal.

Title Document Type Packet Tracer v5.3.3 Application + Tutorial Linux-Ubuntu This is the complete Packet Tracer program including tutorials as a single downloadable package for Ubuntu release 7.10.    (BIN - 103 MB) Packet Tracer v5.3.3 Application only Linux-Ubuntu This option is just the Packet Tracer program and the help files for Ubuntu release 7.10. It does not include the tutorial files. The tutorial files are not necessary to run Packet Tracer.    (BIN - 71 MB) Packet Tracer v5.3.3 Application + Tutorial-Generic Ubuntu This is the complete Packet Tracer program including tutorials for generic Ubuntu   (tar.gz - 104 MB) Packet Tracer v5.3.3 Application + Tutorial Linux-Fedora This is the complete Packet Tracer program including tutorials as a single downloadable package for Fedora release 7.    (BIN - 100 MB) Packet Tracer v5.3.3 Application only Linux-Fedora This option is just the Packet Tracer program and the help files for Fedora release 7. It does not include the tutorial files. The tutorial files are not necessary to run Packet Tracer.    (BIN - 68 MB) Packet Tracer v5.3.3 Application + Tutorial Generic Fedora This is the complete Packet Tracer program including tutorials for generic Fedora  (tar.gz - 101 MB)