The 6.2.0 version of Scorch for Mac is provided as a free download on our website. This free software for Mac OS X is a product of Sibelius, Inc. The software is included in Audio & Video Tools.
From the developer:
Scorch is a free software application that lets you view, play, customize, and print Sibelius scores on the Internet. You can use the Page Up/Page Down and the Up/Down arrow keys to scroll up and down the score. To play music in the background while you work, just set Scorch playing, then minimize the window.
You may want to check out more software for Mac, such as Scorched Earth 1991, Machines at War or Atomic Cannon Demo, which might be related to Scorch.