I am trying to install Diablo 2 and the original Starcraft on my PowerBook G4 but I run into this message. The installer has a red strike through it and when I click it I get that message. I own two copies of Diablo 2 - version 1.0 and version 1.03 both which have the Mac OS installers. I have two versions of Starcraft as well, but only one is Power Mac compatiable, version 1.05. I know that Diablo 2 will not run on Intel based Macs unless you use Boot Camp, but this is a PPC running Leopard... Blizzard has this post, but I am not above OS X 10.5. https://us.battle.net/support/en/article/mac-error-classic-environment-not-supported I'm confused because Snow Leopard was the last version of OS X to support PPC applications through Rosetta. I am on Leopard, so why is there a problem? Google is giving a lot of conflicting answers. Diablo 2 will only run on 10.4 Tiger - Diablo 2 will only run on Mac OS 9, etc. There was apparently an OS X installer made by Blizzard found here - https://us.battle.net/support/en/#OSXNative - but the link just goes to a search page now. Can anyone help?