This "patch" is a new version of the application for Rebel Assault Macintosh. Version 1.05 offers smoother graphics when using the vertical stretch option on large window without skipping video rows. For people using Power Macintoshes or Macintoshes with a PowerPC™-equipped accelerator card, version 1.05p (located in the "Power Mac" folder) is a native mode version, offering vastly increased performance.
You may run the new version(s) either from the floppy disk or off of your hard drive. When you double click on the Rebel Assault icon, the application will read the files off of your Rebel Assault CD-ROM (be sure to have it ready in the CD-ROM drive) and the game will begin.