Version 5.0 offers the following new capabilities which were not available in v4.5:
Use64BitEvents property
GetZipFileInformation64 method
UpdateZipDate method (Brought back in v5.0)
ritingZipContentsStatus event
MovingTempFileStatus event
All events that provide byte/size information have a 64-bit counterpart that can report these sizes properly even if they get beyond 4 gigabytes.