CM Download (CMDM) - Extras - Search
The CM Download Manager plugin includes a search functionality which let you search only for downloads found in the plugin database table. It also support adding the download custom post to the WordPress default search.
To enable the internal search visit the Index Page tab in the plugin settings and enable the search bar:
Controlling the Search Labels
In the Labels tab of the plugin settings you can find labels related to the search functionality which can be customized.
You can use the search form above the tabs to easily find the correct labels:
Adding the Search to WordPress Site Search
It is possible to add the download custom post type to the WordPress site search functionality so that you can search within the download title and description and find related result together with result found in post and pages.
To include the download custom post type, select yes in the Include downloads in the standard WP search result found in the General tab.
You can also enable an option to search download by tags and define the behavior in such case according to the options available: