When you download demo version of software it shows two options:

  1. Complete Repair
  2. Document Recovery

Complete Repair option repair complete SharePoint database & corrupted MDF files.

Document Recovery option recover inaccessible SharePoint site content.

Choose one option on the basis of your requirement.

Complete Repair:

Click ‘Complete Repair’ icon.

Click the ‘Look in Drive’ option to select corrupt MDF file. If you not aware of exact location of the MDF file then you can also search it by  ‘Search file’ option. After that click on “Scan” button.

You will see all recoverable SharePoint server data. Click any particular folder/file to see the preview of inside data. After that click on “Repair”.

Enter the SQL Server name/Instance name and specify the destination path where you want data should be saved.

Click ‘OK’ to complete the recovery process.

Now, click ‘Yes’ to add the recovered database file to your web application.

Just like Complete Repair option you can also use Document Recovery option to recover your SharePoint site content.