The portable version packs its own FFmpeg inside the resources folder. If you move just the .exe without the adjacent folders, it will fail. Fix: Keep the entire extracted folder structure intact.
For IT pros, forensic analysts, and digital archivists, here is the ultimate setup: losslesscut portable download
Have a question about LosslessCut portable? The developer is active on GitHub Issues and the VideoHelp forums. Happy lossless cutting! The portable version packs its own FFmpeg inside