The latest version of Charles is 3.5.2. Read the Release Notes.
Windows 32 bit (4.5 MB)
Windows 64 bit (4.6 MB) Requires a 64 bit Java Runtime Environment (NB: choose the Windows x64 platform)
Mac OS X (5.4 MB) Universal. Compatible with Mac OS X 10.3 - 10.6.
Linux / UNIX (3.7 MB)