From version 2.7.* Download Manager Free moved to custom post type for better performance and security issue. After you upgrade to version 2.7.*, you need to migrate your previous versions’ data. To migrate your old version data to new version, goto Admin Menu Downloads Settings Migrate Tab of your WordPress admin panel. Follow the instructions written their.
Things to remember:
1. You need to manually re-assign download icon for every post from Admin Menu Downloads All Files
2. You need to reassign categories for each files manually.
3. Existing Category ShortCode will not work, you need to change all category ShortCode manually. However, you can install Advanced TinyMCE button AddOns for free to easily place shortcode in a page or post.
4. You can install Free AddOns to extend functionality for Download Manager.
*If you don’t want to do update to the latest version, you can still use Download Manager Version 2.6.96