Hi Alex,
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Please use this link to download the latest installer (QWP 5.7). Once you download the exe run it and it will display a splash screen with different sections. One of them is to the docs.
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http://www.quest.com/web-parts-for-sharepoint/
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Since you're on QWP 5.4 SP2007 please send me your email and I send you the chm file since I can't attach it to this tread.
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