When the "Build project" dialog opens, you first need to create a folder into which the saved converted project will be placed. Select the drive where you are going to create the folder, and click the "Create new folder" button.
"Build project" dialog
The "Create sub-folder to" dialog is now displayed. Create the folder into which the project will be placed then click "OK".
Creating a new folder
hint
In order to organize and manage your projects more easily, you can create a folder on the hard drive to hold all of your completed, compressed DAISY projects. Within this folder you can create separate folders for each of the completed projects. Note that each project must be contained in a separate folder.