The Ultimate Edition is optimized for large-scale operations and uses the Windows system file index to provide search speeds that are "orders of magnitude" faster than the Professional version.
It features a dual-pane interface that allows you to view two directories side-by-side, which significantly speeds up dragging, dropping, and comparing files. Ultimate vs. Professional: The Ultimate Edition is optimized for large-scale operations
Seeking "license keys" or "cracks" for version 5.3.0.2 from unofficial sources is dangerous. xplorer² Windows File Manager (Explorer replacement) which significantly speeds up dragging