While the old "buy once, own forever" model is gone, you can still purchase Lightroom as a rather than a full Creative Cloud bundle.
: While you might find old copies of Lightroom 6 from third-party resellers, it will not support newer camera RAW files and may have compatibility issues with modern operating systems. buy lightroom cc standalone
The last true standalone version of Lightroom was , released in 2015. Adobe officially ended support and updates for it in 2017. While the old "buy once, own forever" model
: This plan is for the cloud-based Lightroom (formerly CC). It typically costs around $11.99/month (or $119.88/year) and includes 1TB of cloud storage. Adobe officially ended support and updates for it in 2017
The short answer is Adobe transitioned to a subscription-only model for all updated Creative Cloud applications years ago.
: Users have reported that Adobe has decommissioned some older activation servers, potentially rendering even legitimate old serial numbers useless.