The Centennia Historical Atlas software runs under Apple Macintosh OSX (Intel Macs running Leopard, Snow Leopard) and Power PCs running 10.4.1 or later, as well as Microsoft Windows 7, Windows Vista, and Windows XP. The software requires 20 megabytes of hard disk space and 40 megabytes of memory. Centennia does not have any other significant system requirements, and it will run well on almost any computer made in the year 2003 or later.

The files available for download here include all text and map data covering ten centuries of European and Mid East history. The French Revolutionary and Napoleonic Period (1789-1819) is available at no cost. To access the full time period, you will need to purchase an access code.

Download Centennia for Macintosh:

The Macintosh OSX download is a disk image (dmg) file. This is a "Universal application" which means that this OSX software runs on both Intel-based and PowerPC-based Mac computers natively (also fully-compatible with Leopard and Snow Leopard). Download it, then drag the Centennia application to your computer's desktop or hard disk. Double-click to run the software.

Download Centennia for Windows:

The Windows 7, Windows Vista/XP download is a zip file containing the Centennia Windows Setup program. Download it, open it, then double-click "Centennia Windows Setup" to install the software. Then double-click the Desktop Centennia icon or select it from the Programs menu to run the software.