Product Manager Plugin Issues

My non-ecommerce site was built with what appears to be an outdated product manager plugin that is no longer supported. The plugin is simply called “Product Manager” by Jafir Ahmed. It’s worked well until today when I noticed that some text on the site had changed. When I fixed it via the Product Manager plugin, the perma-link to that page was lost in the final HTML code. There is a php template for the page which appears to convert the info from the plugin into the final coding for the overall page. When I undo the edit, the links are still broken and I have to reload from backup files. It’s the strangest thing.

I’m trying to see if I can locate an update for this plugin or find a new supported plugin that will work the same. Anyone have knowledge or experience with this plugin or one that will do the same thing.

Website is envirawood.com to see the “Veneers” page. where the ” text has been replaced by (51”x108”). Product manager is used in several pages of the website.