Page not found when using plugin

Hi, i am using the 3.2.19 version of Download Manager for file downloads on our website and it has worked great in the past. However I noticed now that whenever I created new pages on wordpress, all of these new pages cannot be found. I disabled all plugins and reactivated them one by one and it seems that the plugin that creates this error is the Download Manager. When Download Manager is disabled and a reset permalinks, then the pages load properly. Do you have any experience with this?

Here is an example link: https://www.karamba3d.com/download/new-in-karamba/

Thank you