are their any known plans to update the flatfilec correction plugin to 64 Bit for the upcoming Mac OS 10.14 or do I have to move to Capture One ?
I assume that is a third party plugin, so you’d have to ask the author.
No it is a Adobe Lab plugin
Both 64 bit and 32 bit versions are currently available. What makes you think it will need updating?
Plug-ins for Adobe Photoshop Lightroom | Adobe Labs
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