oceansdg on "[Plugin: Post Type Switcher] Preserve url permalink issue"

Hi, I'm in the process of changing theme and working on duplicate site. I would like to change pages to posts for more functionality and tried this plugin as it's exactly what is needed. It changed the page to custom post however it made the permalink the custom post type instead of preserving the page permalink (the new theme comes with 3 custom post types). The wordpress permalinks are set to custom structure http://site.com/%category%/%postname%/
Could this setting be the problem or can you advise what I could check that might be making this happen. The page permalinks have 3 levels to the structure in some pages but mainly 2 levels from the website name. Thanks

https://wordpress.org/plugins/post-type-switcher/