If you don't have a license, you can use the free trial version, which is available for 30 days. The free trial allows you to test FL Studio 12, but it will not allow you to save or export projects.
If you want to try FL Studio 12 without purchasing a license, you can download the trial version directly from Image-Line: Fl Studio 12 Download 32 Bit
http://www.image-line.com/flstudio/trial/flstudio12win32bit_trial.exe If you don't have a license, you can