Adobe CS4 issues on OS X 10.10 Yosemite and_or OS X 10.11 El Capitán_Possible fixes

Adobe CS4 is unstable or works for "crawp" on OS X Yosemite AND El Capitán.

That is why I still have working versions of OS X 10.8.5 Mountain Lion and OS X 10.9.5 Mavericks

OS X 10.9 Mavericks is no longer available.

If you have an older Mac that ran an older OS X version, you could backup/clone your current system to an external hard drive and reinstall your older OS X system that came with your Mac, (if it is OS X 10.8 or 10.9) that is still fully compatible with Adobe CS4.

If your Mac is older, but didn't come installed with OS X 10.8 or 10.9

OS X 10.8.5 Mountain Lion is still available as a paid code for download from the Mac App Store.

Purchase a fast data transfer connected, external hard drive or externally enclosed SSD and pay for, download and install OS X 10.8.5 Mountain Lion to the external hard drive, boot to the external drive and install Adobe CS4 and any updates and fixes while booted to the external drive and run Adobe CS4 with no issues from a fast, external drive.

OR

Purchase a fast data transfer protocol hard drive or enclosed SSD and use data cloning software, like Bombich Software's CarbonCopyCloner or Shirt Pocket's SuperDuper and clone your entire El Capitán system to the external hard drive and then pay for and install OS X 10.8.5 Mountain Lion, using the special paid download code for the Mac App Store, and install it on your Mac's main internal hard drive and then install Adobe CS4 and anything else you need for apps back onto your Mac's internal hard drive and run your Mac with this older OS X on your Mac's main internal hard drive.

OR

If your Mac is already running OS X 10.10 Yosemite or OS X 10.11 El Capitán OR your Mac is too new and shipped with OS X 10.10 Yosemite or El Capitán, your only other option to get a chance at a fully working Adobe CS4 is to run it in software virtualisation mode running a older version of OS X, like OS X 10.6.8 Snow Leopard OR the paid download of OS X 10.8.5 Mountain Lion.

Install a updated version of Parallels Desktop, VMWare Fusion or the free, open sourced virtualisation software called VirtualBox.

Install and launch VirtualBox.

Then, install the older OS X version inside the virtualisation software, start/launch the older OS X version, then install the Adobe CS4 software and CS4updates the same way you would running OS X normally, and then launch and run Adobe CS4 in a virtualised OS X environment, instead.

Good Luck to all!