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jose - try downloading again, try using a different browser. the download works fine for other users, so I recommend just keep trying.
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shisha - you have to have a REWRITE mod installed for IIS. This post links to a few solutions:
http://www.petefreitag.com/item/286.cfm
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tron - there's no point in having a catalog if you use this mod. the intention of this mod is to provide html urls dynamically. Additionally, regarding your product.php issue, that suggests that in your htaccess file you have blocked access to product.php