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I am running LR version 6.12 on Mac with MacOS 10.13 (High Sierra). If I upgrade MacOS to a 64-bit only version (anything after High Sierra) will LR 6.12 still run? Has anyone tried it?
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Migration Assistant is not needed if you upgrade MacOS. It is only needed for transfering apps, docs and settings between computers, for example if you buy a new Mac.
One word of warning: the license verification is also 32 bits. If Lightroom ever thinks it needs to verify your license again, you're in trouble if you've upgraded to a 64 bit only OS.
There have also been reports that after updating to Mac OS 10.15 or 11, LR 6 ran correctly for a while and then stopped (not related to the known problems with LR 6 face recognition no longer working). So if you do upgrade Mac OS, be prepared for a possible failure of LR 6 at any point.
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Yes it will still run if it's still installed (i.e. if you use the Migration Assistant to bring over the currently-installed apps) on all the later MacOS versions. The problem will occur if you have to install the app, as the installer is 32-bit, so it cannot be installed on any MacOS version after Mojave (10.14).
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Migration Assistant is not needed if you upgrade MacOS. It is only needed for transfering apps, docs and settings between computers, for example if you buy a new Mac.
One word of warning: the license verification is also 32 bits. If Lightroom ever thinks it needs to verify your license again, you're in trouble if you've upgraded to a 64 bit only OS.
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There have also been reports that after updating to Mac OS 10.15 or 11, LR 6 ran correctly for a while and then stopped (not related to the known problems with LR 6 face recognition no longer working). So if you do upgrade Mac OS, be prepared for a possible failure of LR 6 at any point.