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[simple-download-monitor.php]

Well finally I got this plugin working correctly, the current environment is:

- My website is installed at  /wordpress/ (as you can see, is not "root path")
- I used .htaccess to open my web at www.domain.com instead of www.domain.com/wordpress/
- I'm using permalinks like this: www.domain.com/%postname%/
- My downloads folder is at /files/ (outside of wordpress installation)

Sincerely I tried lot's of  combinations in configuration, option values etc etc etc, that I can't remember what I have done, but I will share the two changes I have done in simple-download-monitor.php:

- First Change: In function Download(), ABSPATH was pointing inside /wordpress/ so realpath() was returning false, so I added the following code after the $fullfilename and $relfilename value assignation.

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if ( ! $fullfilename ) { // If WP installation is not at root    
    $fullfilename = realpath($_SERVER['DOCUMENT_ROOT'] . '/' . $filename);
    $relfilename = substr($fullfilename, strlen($_SERVER['DOCUMENT_ROOT']));
}

and now that section looks like this;

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// Normalize the filename
$fullfilename = realpath(ABSPATH . '/' . $filename);
$relfilename = substr($fullfilename, strlen(ABSPATH));
if ( ! $fullfilename ) { // If WP installation is not at root    
    $fullfilename = realpath($_SERVER['DOCUMENT_ROOT'] . '/' . $filename);
    $relfilename = substr($fullfilename, strlen($_SERVER['DOCUMENT_ROOT']));
}
$relfilename = strtr($relfilename, '\\', '/');
$exists = (file_exists($fullfilename) AND !is_dir($fullfilename)) ? 1 : 0;

- Second Change: I just modified the regular expression in the $dirregexp value assignation, replacing '^' with '^\/?', so the code looks like this:

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// Make sure it is a valid request
$dirregexp = self::PREG_DELIMITER . '^\/?' . get_option(self::PREFIX . 'directories') . self::PREG_DELIMITER;
$extregexp = self::PREG_DELIMITER . '\\.' . get_option(self::PREFIX . 'extensions') . '$' . self::PREG_DELIMITER;
$valid = (preg_match($dirregexp, $relfilename) AND preg_match($extregexp, $relfilename)) ? 1 : 0;

This is because relative path might start with or without a slash.

Well I hope this helps to somebody else, and I suggest this to be added in the next versions of the plugin, by the way just want to say that is a nice plugin.

P.D. Sorry for my bad english, I'm mexican.