Version 4.5 offers the following new capabilities which were not available in v4.2:
Supports the advanced new BWT compression method (burrows-wheeler transform) for 20 30% better compression than PKZIP 2.04g on many popular file types.(New in v4.5)
Can create self-extracting Zip files for both the traditional PKZIP 2.04g compression method as well as the advanced new BWT compression method.(New in v4.5)