The module is intended for interception and redirection of non-existent pages of your store.
It allows you to monitor in real time non-existent pages (404 pages), which can have a negative impact on SEO optimization of your store.
It has additional functionality, which can be ignored detection of nonexistent pages url which has in itself certain words.
Extract the content of the archive to the root of the site and install in admin panel (Extensions -> Modules -> 301 Redirect pages -> Install).
You need to have also installed vQmod.