The easist way to install spin is to use Eclipse and import it as a java project.
THIS BETA SOFTWARE IS BELIEVED TO CONTAIN DEFECTS. USER IS ADVISED TO SAFEGUARD IMPORTANT DATA, TO USE CAUTION AND NOT TO RELY IN ANY WAY ON THE CORRECT FUNCTIONING OR PERFORMANCE OF THE SOFTWARE.
Download & Install Eclipse
If not allready installed, download and install a java Eclipse IDE. If you're not familiar with the different eclipse versions, choose one of the following.
Select File->Import->Existing Projects into Workspace
Now select the download file and press 'finish'.
After import is finished you see this project.
Select one of the example files and press 'run'.
You will get an output similar to this.