The Centennia Atlas
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The Centennia Historical Atlas software runs under Apple Macintosh OS X (Mavericks, Mountain Lion, etc.), as well as Microsoft Windows (Windows 10, 8, 7, etc.). The app requires 20 megabytes of disk space. Centennia does not have any other significant system requirements, and it will run well on almost any computer manaufactured in the past ten years.
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, all ten centuries from 1000 AD to the present, you will need to purchase an access code.
Note: If you get a security warning, option-click on the file and then select 'Open' from the sub-menu.