From my experience on installing Luminar 4 on my iMac and MacBook; I had to create new catalogs otherwise both systems would crash on startup of Luminar 4. I suggest that the development team automatically create a new catalog then provide a tool to import the old catalog after the installation is complete. If a tool is not feasible, part of the installation should be to for Luminar to import existing catalogs to a newly create catalog during installation. From some of the FAQ's that I track this seems to also be an issue on Windows devices.
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