Pentango is free, however after installation you must enter the following information to unlock the trial version:
Serial Number: 18316
(all versions of Windows supported)
(Pentango is free, but you may make a voluntary payment if you are so inclined)
After clicking on the download link above, select either Run or Save. If you select save, double click on the file you just saved (PentangoSetup.exe or PentangoSetupPPC.exe) to start the installation process.
Pentango is distributed as a 30-day trial. Enter the code shown above to continue playing beyond 30 days.