Download directly from the Adobe Legacy Trial Servers for Mac.
Note: If the direct server paths change or error out due to browser security protocols, users can reference alternative archived installers hosted securely on the Wayback Machine Archive. Key Features of Lightroom 5.7.1
stands as a landmark release in the history of photography post-processing software. Released on December 15, 2014, it represents the final and most stable update of the standalone, non-subscription Lightroom 5 series. For photographers who prefer a perpetual license over modern, cloud-based Creative Cloud subscriptions, tracking down a secure download of this specific vintage tool is highly desirable. Official Legacy Download Links
Adobe maintains official repository mirrors for its legacy software catalog. Ensure you have your original 24-digit ready before running the installer, as it is required to activate the software past the 30-day trial mode.
Download directly from the Adobe Legacy Directory for Windows.
The 5.7.1 minor patch was specifically pushed to extend the operational lifespan of the local database tool. It added critical elements that made it viable for long-term production use: Upgrading to Lightroom 5.7 - Adobe Community