If you want SEO of your site more than now. Please do this h@ck to change download link
http://yoursite/engine/download.php?id=1
to
http://yoursite/dl/1_files_example.zip
GO GO GO
1 Open file .htaccess and find
Below it add
2. Open file engine/modules/functions.php and find
Replace to
There are 2 place you need to replace in this step.
http://yoursite/engine/download.php?id=1
to
http://yoursite/dl/1_files_example.zip
GO GO GO
1 Open file .htaccess and find
RewriteEngine On
Below it add
# Download link
RewriteRule ^dl/([0-9]+)_(.*)(/?)+$ /engine/download.php?id=$1 [L]
RewriteRule ^dl/([0-9]+)_(.*)(/?)+$ /engine/download.php?id=$1 [L]
2. Open file engine/modules/functions.php and find
engine/download.php?id={$row['id']}{$area}
Replace to
dl/{$row['id']}{$area}_{$row['name']}
There are 2 place you need to replace in this step.
Updates 
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