If you specifically need version 10.4 for compatibility, you may need to contact Adobe Support directly via chat, as only recent versions are typically listed for direct download.
Version 10.4 was a significant update focused on stability and expanding hardware support: If you specifically need version 10
To run the latest versions of Lightroom Classic smoothly on your Mac, ensure your system meets these specifications: including all contained collections.
Introduced a new ability to duplicate entire Collection Sets , including all contained collections. If you specifically need version 10