Don’t bother

I agree with the last reviewer. This plugin is all over the place haphazardly leaving its current users in the dark about the needed cleanup. The code could have been a bit more complete, as there are now numerous users who will suffer without knowing about the changes made over the last versions, thereby leaving the SEs to get confused with the multiple issues the author has created.

The plugin author has changed the sitemap URL and the plugin and therefore, one must login to the server to delete old deprecated sitemaps that will only confuse the search engines.

As already mentioned, if you were utilizing this in your robots.txt, you will also have to alter that as well, also realize that this plugin has drastically changed over the last versions. If you still have the old compressed version of the sitemap on your server, you will have to delete those too.

Keep in mind that the search engines have been doing just fine reading alt-text and img-atts for years. With the new algorithms, they will find your images just fine. To use the sales line that this plugin utilizes “Alt Text” is redundant, because alt-text has been used to identify photos for years and years without any problems whatsoever.

If you care about your images being found on the SEs, then just write good quality Img-Atts & Alt-Text. There has never been a need for plugins like this, as they would only bloat your plugin list unnecessarily.