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I am currently running Photoshop 2015.5 on a desktop imac and am not planning to upgrade my OS due to some older programs I need that will not run on newer OS. If I were to purchase a new imac, would I be able within my same PS CC subscription to run Photoshop 2020 on the new computer while still running 2015.5 on the old one?
Yes - that should work fine. Your license enables 2 installations to be active at any given time, but doesn't specify that they need to be the same versions. I ran 2016 on one computer and 2018 on another for some time. I haven't tried it since then, but at the time, I had no problems.
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Yes - that should work fine. Your license enables 2 installations to be active at any given time, but doesn't specify that they need to be the same versions. I ran 2016 on one computer and 2018 on another for some time. I haven't tried it since then, but at the time, I had no problems.
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That is no problem, other than Adobe no longer allows downloads of older PS versions, so make sure you don't need to reinstall 2015 for any reason.
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Thanks for your input!