I want to transfer a legal, licensed copy of Photoshop CS5 from and old Lion iMac I am de-commissioning to my current El Capitan system. I have the license number, but not the install media as this copy of Photoshop started off as CS3 and then I did an online upgrade to CS5. So I don't have CS5 install disks.

So I go to Download CS5 products and download the OS X install file for Photoshop CS5. However when I went to run the installer I was presented with this:

Photoshop CS5 Install fail

Obviously something has gone wrong. However I am not sure if this is an artifact related to not having Java 6 installed (See Will Adobe CS5 with Java SE runtime work on 10.11 El Capitan?) or if the file is actually hosed. But Is it possible to use Adobe CS5 with Java SE 7? makes me think I should get past an install.

I don't believe that I have Java installed (and I only saw that question when I was composing this one), but I also don't want to have to jump through hoops to get CS5 up and running again.

Update - When I right click on the installer and select Show Package Contents I appear to be able to see the internals without any problem.

  • You can install without Java so this is an issue with the download being damaged. You might try another browser or clearing your browser cache and rebooting. Commented Aug 2, 2017 at 16:19
  • @user3439894 That does not make a difference and I can see the package contents
    – Peter M
    Commented Aug 2, 2017 at 16:25
  • @user3439894 And that's why I said That does not make a difference
    – Peter M
    Commented Aug 2, 2017 at 16:38
  • Under System Preferences > Security & Privacy > General > Allow apps downloaded from:, what is selected? If it’s not Anywhere, then select Anywhere and then eject and remount the DMG file and try installing again. Does that make a difference? Commented Aug 2, 2017 at 16:53
  • @user3439894 The security was the issue. But it was not presented in a very user friendly manner. Plus I would have expected OS X to recognize Adobe. Anyway Its all moot as CS5 won't accept my CS3 license number and I certainly don't have the upgrade media any more nor can I find record to show adobe. Plus the Java issue etc
    – Peter M
    Commented Aug 2, 2017 at 17:16

1 Answer 1


As per the comment from user3439894 the issue was that I had

System Preferences > Security & Privacy > General > Allow apps downloaded from:

set to

Mac App Store and identified developers

Once I set it to be


Then I could run the installer.

The error message I received was disingenuous and did not inform me of what the actual problem was.

Protip - Even though Adobe wouldn't tell me what my CS5 license number was there are ways to extract it from OS X. It just took some googling.


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