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Adobe CS4 is unstable or works for 'crawp' on OS X 10.10 Yosemite AND OS X 10.11 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
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- Download OS X Yosemite For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS. If you still need OS X Yosemite, use this link: Download OS X Yosemite. A file named InstallMacOSX.dmg will download to your Mac.
- Installing Adobe Reader is a two-step process. First you download the installation package, and then you install Adobe Reader from that package file. If you're running Mac OS X 10.9 or later, install the latest version of Reader. For step-by-step instructions, see Install Adobe Acrobat Reader DC on.
I am on Yosemite 10.10.1. For some reason (maybe corrupted initial download) the 1.2MB installer stops at around 30% (34%, 35% or 36%) downloading the full installer. Macos mac yosemite adobe-flash.
OS X 10.9 Mavericks is no longer available for download from the Mac App Store.
The only older version of OS X that is left for download and is fully compatible with Adobe CS4 is OS X 10.8.5 Mountain Lion.
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
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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!
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This user tip was generated from the following discussion: Adobe CS4 issues on OS X 10.10 Yosemite and_or OS X 10.11 El Capitán_Possible fixes