Follow these steps:
- Open Netbeans
- Click File > New Project > JavaFX > JavaFX with existing sources
- Click Next
- Name the project
- Click Next
- Under Source Package Folders click Add Folder
- Select the nbproject folder under the zip file you wish to upload (Note: you need to unzip the folder)
- Click Next
- All the files will be included but you can exclude some if you wish
- Click Finish and the project should be there
If you don't have the source folder added do the following
- Under your projects directory tree right click on Source Packages
- Click New
- Click Java Package and name it with the name of the package the source files have
- Go to the directory location (i.e., using Windows Explorer not Netbeans) of those source files, highlight them all, then drag and drop them under that Java Package you just created
- Click Run
- Click Clean and Build Project
Now you can have fun and run the application.