This is sure to be a very sad day for a lot of photographers and Lightroom lovers that do not love the subscription based model of Adobe's current software.
From the Adobe Journal:
The goal of this release is to provide perpetual customers additional camera raw support, lens profile support and address bugs that were introduced in previous releases of Lightroom. You should only update to Lightroom 6.14 if you are currently holding a license to our perpetual product.
Please note, there will be no additional updates after 6.14 for the perpetual, standalone version of Lightroom. You can check out this blog post for more information when this was announced earlier.
As always, new cameras are supported for legacy versions of Lightroom, Photoshop, Bridge, After Effects, and Photoshop Elements through the free Adobe DNG Converter.
For native camera raw support and ongoing updates with new features try out Lightroom Classic or Lightroom CC. These features include color and luminance range masking and the new auto. This along with other future imaging and performance enhancements are automatically included with a membership.
Find the latest available downloads of Lightroom 6 here. If you have a Creative Cloud plan of any type, you do not need to purchase Lightroom 6.