Review and download the code at SourceForge . Conclusion
Security researchers consistently warn against downloading obscure file utilities from third-party sites. Here is what virus scans of "Super Copier 512" installers have shown: super copier 512 high quality free download
Instead of the whole transfer failing because of one "in-use" file, it logs the error and moves on to the rest of the queue. Review and download the code at SourceForge