I bumped into this recently with a couple Kodak PhotoCDs I uncovered last month. Trying to get the pictures out of the PCD files is turning out to be more challenging than I expected.
iPhoto no longer exists and the replacement, Photos doesn't support it. A free command-line tool I found doesn't run any without signing and I need to find the dependent library for JPEG handling to use it. Other apps are paid.
https://en.wikipedia.org/wiki/Photo_CD#Converting_Photo_CD_i...