Lightroom 6 was discontinued years ago. A cracked version won't receive updates for newer camera RAW files. If you buy a new camera, a cracked version of Lightroom 6 likely won't be able to open your photos.
It is common to see searches for or "serial keys" because Lightroom 6 (also known as Lightroom CC 2015) was the last version of the software available as a one-time purchase before Adobe moved exclusively to the Creative Cloud subscription model.
A one-time purchase professional editor that often goes on sale for under $50.
Cracked software often lacks the necessary DLL files or has modified code that causes frequent crashes, especially on newer operating systems like Windows 11 or macOS Sonoma.