Development
As it was initially designed when Windows XP was the current version of Windows, Sumatra has some incompatibility issues with earlier versions of Windows. Support for Windows 95, 98 and Me has since been dropped completely.
Kowalczyk has not released a 64-bit version of Sumatra, indicating that while it might offer slightly more speed and more memory available it would greatly add to user confusion and that the benefits do not outweigh the potential costs.
The source code can be downloaded either via its Subversion development repository or as a tarball.
The Sumatra source code is hosted on Google Code and because of US export legal restrictions is thus not available "in countries on the United States Office of Foreign Assets Control sanction list, including Cuba, Iran, North Korea, Sudan and Syria."
Read more about this topic: Sumatra PDF
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