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Joined
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It's still not clear what you mean by "lightroom" in this context. If you mean the catalog, previews and image files, there's no problem in having those on a different drive (internal or external, but the catalog cannot be on a network drive).

But if you mean you want the actual program executable files to be installed onto a different drive, I believe you can use the settings in the Creative Could Desktop app to set a different installation location (Setting>Apps tab).
 
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