You can download:

the FirstClass 12 Client with all languages for Windows (XP/Vista/7),

the FirstClass 11 Client with all languages for Windows (XP/Vista/7),

the FirstClass 10 Client for Windows (XP/Vista/7) with Canadian or US spellcheck,

the FirstClass 9 Client for Windows (2000/XP/Vista/7) with Canadian or US spellcheck,

the FirstClass 8 Client for Windows 98,

the FirstClass 12 Client with all languages for Intel MacOS X, 10.5.x or higher,

the FirstClass 11 Client for PPC MacOS X, or 10.4.x Intel,

the FirstClass 10 Client for MacOS X with Canadian or US spellcheck, or

the FirstClass 10 Client for Linux Debian, or Generic Intel.

the FirstClass 9 Client for Linux Debian, or Generic Intel.

the FirstClass Mobile Client for Android

the FirstClass Mobile Client for Blackberry

the FirstClass Mobile Client for Blackberry OS 7 (Bold 9900)

or the FirstClass Mobile Client for iPhone

or if you would rather download direct from FirstClass, you can visit the FirstClass Resources Page