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Download our 15-day Free Trial and you will quickly see that PDF Stacks is the right tool for you. Easily collect and organize your PDF files in a systematic way. Save time by not looking all over your computer for a PDF. With the full version, your program never expires. Best of all, whenever we release new versions, your program will automatically update to the latest version for free, without paying a single dime. The current version was released June 9, 2011. Whenever you need help, we are here to assist you.