Can I create automatic internal links to other WordPress installations available in subdomains or domain folders?

This plugin uses as a prefix for the automatic internal links target the Site Address (URL) option defined in the Settings -> General menu. For this reason, you can only create automatic internal links associated with URLs that start with this prefix.

If you want to create automatic links to any URL we recommend Autolinks Manager. In this FAQ you can find the main differences between the two products.