I committed the 1.30 version of the Permalink Finder to the repository this morning. This was my first plugin and one of the most useful. I added links to the 404 error pages and referrers so that you can check why a page is not being found. I also added the uninstall routine which will get rid of the modest amount of data the thing collects.
There is no urgent reason to update other than to get rid of the red mark on your admin page.