Finding a legitimate, unused Lightroom 6 serial number is nearly impossible today. Adobe no longer sells them, and most third-party retailers (like Amazon or B&H) exhausted their stock years ago.
Be extremely wary of eBay sellers offering "digital delivery" keys for $10–$20; these are almost always volume licenses that have been over-sold and will eventually be blacklisted by Adobe. Modern Alternatives to Lightroom 6.14 lightroom 614 license key top
The search for a is a common journey for photographers who prefer the "buy it once, own it forever" model over Adobe’s current Creative Cloud subscription. Lightroom 6.14 was the final standalone, perpetual version of the software before Adobe moved exclusively to the subscription-based Lightroom Classic and Lightroom CC. Finding a legitimate, unused Lightroom 6 serial number