Downloading and installing these versions from unofficial sources often leads to several problems: Why does everyone use Lightroom Classic over Lightroom CC?

Preactivated software is typically a "cracked" version where the executable files or DLLs have been altered to fool the application into believing it is already registered. In the case of Lightroom CC—Adobe's cloud-based photo editor—this is particularly complex because the official version relies heavily on Adobe Cloud storage for syncing photos across devices. Significant Risks of Preactivated Versions