The desktop computer on which I had Lightroom and Photoshop CC installed failed and I no longer have access to it. How do I deactivate LR & PS on the old machine so that I can reinstall it on my new Mac?
No need to deactivate Lr.
As for PS, these might be better forums for the question:
Photoshop General Discussion
Adobe Creative Cloud
I have the same question. It doesn't seem possible from the web, and contacting support to ask Adobe to do it also seems impossible.
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