While you might have seen this term on a specific download site, "deep story" is not a technical term for Adobe software.
: You can download Adobe Lightroom Classic directly from the official Adobe website.
: If you specifically need v10 (the 2021 release), you can often find older versions within the Creative Cloud Desktop app . Go to the "All Apps" tab, click the three dots ( ... ) next to Lightroom Classic, and select "Other versions" .