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I have a new iMac 3.7ghz
24 gb memory.
Never had any problems in my old iMac, but now Lightroom don't open.
What can i do?
Provide more details. What operating system version number? How did you transfer Lightroom to your new computer (step-by-step)? What happens when you try to open it? How far do you get in the opening process? What is the word-for-word error message?
You cannot install Lightroom 6 on Catalina. Impossible.
Your options are to upgrade to Lightroom Classic, or downgrade the operating system, or use some other software.