: musical space invaders fully functioning no features have been disabled. musical space invaders is an extremely versatile program, programmed by a professional pianist and composer to helps pianist to learn piano and improve their sight-reading skills. it programmed by a professional this is a macintosh osx version only.installation can be done by double click on musical space invaders 3.0 (osx) zip file and extract it to your hard drive. this will happen automatically after downloading the program with safari. the program must live in the musical space invaders 3.0 folder but you can drag the program icon to the doc bar making a short cut. double click on the program icon when you are ready to start. to use this program with an external midi keyboard you will need a midi keyboard with a usb connection. make sure your midi keyboard and drivers are properly installed. this is a trial version of the program. it will expire 30 days after you first launch it. make sure you have downloaded the program first and have tested it on your platform before purchasing the program. it is not a common practice to give refunds on software. this will happen automatically after downloading the program with safari. is not a common practice to give refunds on software. if it is used properly, the note reading facility attained only after years of piano lessons can be compressed into a few months. take greater control of your musical destiny.