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Download the stable 2.1.1, 2.3.2, 2.4, 3.0 from MEGA x86 or the X64 version
Author site http://blog.kowalczyk.info/software/sumatrapdf/
What is Sumatra PDF?
Sumatra PDF is a slim, free, open-source PDF viewer for Windows.
Why another PDF reader?
Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features.
It's small and starts up very fast.
It's designed for portable use: it's just one file with no external dependencies so you can easily run it from external USB drive.
Here's how it looks in action: