When using Mass File Download, you have the option to customize its features based on your needs. However, if you're in a trial period, you won't be able to enjoy all the features.
As a trial user, there are certain limitations. You can only download up to 15 MB of files in total, and you can only see and download the first 10 files on each of the four tabs. This means you won't have access to the unlimited download feature.
Additionally, some advanced features like Advanced Search, Filter for Related Files, and Attachments SOQL are not available during the trial. To use these features, you'll need to Subscribe to the Mass File Download.