Can not reinstall CS5 on my Mac [OS is El Capitan]

I need to reinstall CS5 photoshop for Mac on my Retina Macbook Pro running El Capitan. Customer support sent me to:

where I dowloaded the install file:

Photoshop_12_LS1.dmg

It prompts me to click on the Adobe Photoshop CS5 folder then reveals an Install file. Pressing the install file gives me:

“Install” is damaged and can’t be opened. You should eject the disk image."

What am I missing?

[Title edited for clarity... Mod]

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Participant

i had the same problem, you need to allow apps downloaded from anywhere. go to system prefs security

Participant

same thing happened to me

Community Expert

LOTS of problems with El Capitan and old software... something in one of the links below may help

-above in Premiere Pro discussions, but MAY help with other programs

-and a long general discussion of El Capitan https://forums.adobe.com/thread/1967492

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