I have a few comments on the Mac Systems Requirements for Myst IV, which I realize come from the UbiSoft website:
I have found that once installed on a PPC PowerMac running Mac OS X v 10.4, this game runs fine under as high a version of Tiger as v 10.4.11. However, because of changes in Java included in OS X updates beyond v 10.3, Myst IV cannot be installed to those later versions. (The Myst IV installer will fail to find certain Java files.)Requirements for MAC
Supported OS: OSX 10.2, 10.3 (only)
Processor: G4 700 MHz or better (G5 recommended)
RAM: 128 MB RAM
Video Card: 32 MB video card (64 MB recommended)(see supported list below)
Sound Card: Standard
QuickTime: Version 5 or higher
DVD: 4x DVD or faster
Hard Drive Space: 3.5 GB free
Supported video chipsets:
-- AMD/ATI Radeon 7500 to 9600 or later
-- NVIDIA GeForce 2/4/FX families or later
These chipset families are the only ones that will run this game. However, laptop models of these chipsets are NOT fully supported.
My solution to this was to run an "Archive and Install" operating system installation from my original Mac OS X v 10.4 installation disc, then install Myst IV, then install the v 1.0 to 1.03 Myst IV patch, and then update the operating system to 10.4.11 using Apple's "Combo Update." This is something of a pain, but once installed in that manner, the game will play fine under 10.4.11.