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The problem is sometimes pc's hide files with just an extension name.
.htaccess is the file in question, if this is missing it will cause all kinds of problems.
If you have an active purchase just login to your account and go here..
Now download the txt.htaccess.
Now upload it to your server where the script is hosted and rename it on the server to just '.htaccess'.
Your 404 error should now be resolved.