The current QuickTake 100 software shipping with the QuickTake 100 camera (M1644LL/B) is compatible with the Power Macintosh computers. However, if your QuickTake 100 model number is M1644LL/A, then you need to obtain an update disk for the Power Macintosh. The QuickTake for PwrMac v1.0 disk is used in conjunction with the two QuickTake disks you received with your camera. The additional software disk is available from online services.
You can search for, and download the software from the Apple Software Updates web site at http://www.apple.com/swupdates.