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I do a newsletter and I've been using Adobe Creative Suite 4. Now I find that I must upgrade my MacOS Sierra operating system to get some other programs to work. If I go to MacOS Catalina and upgrade to the Adobe Creative Cloud, will the programs I need work? They are InDesign, Illustrator, Photoshop, and Acrobat.
No CS4 wont work on Catalina. We cannot say like it will never work at all. But its very risky to run legacy applications on Latest OS.
Reference :
https://helpx.adobe.com/ie/photoshop/kb/photoshop-and-macos-catalina.html#Knowncompatibilityissues
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CS4 won't.
What are the complete computer specs, including hard drives (how many, what kind, what is on each, and how full)?
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No CS4 wont work on Catalina. We cannot say like it will never work at all. But its very risky to run legacy applications on Latest OS.
Reference :
https://helpx.adobe.com/ie/photoshop/kb/photoshop-and-macos-catalina.html#Knowncompatibilityissues
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Apple set it up so you can't install software over 2 years old to Catalina. So you can forget all your old apps - Adobe apps and all the other apps. This is part of the Joy Of Mac. Creatve Cloud subscriptions are available for about $50 per month.
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Consider dual boot, by the way...