Lightroom won't open on my mac

I am attempting to activate Lightroom on a mac. I've used it on this computer in the past and it suddenly stopped working. I deleted the file and installed the product again. The installation went through, but Lightroom won't open. I tried deactivating the product before deleting, but there was no option. What am I missing?

What happens when you try to open Lightroom?
What is the error message?
What version of Lightroom?
What operating system?

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