Hi,
Please note that the CAB files are compressed by Advanced Installer (both 4.1.2 and 6.1 versions) when the "Compress CAB files for smaller size" option is selected in the "Media" page. The CABs cannot be compressed even more because they do not support it.
However, in the 6.1 version you cam use the LZMA compression for an even smaller installation package (this option is available only in an Enterprise project). You can read more about this here:
http://www.advancedinstaller.com/user-g ... ssion.html
http://www.advancedinstaller.com/user-g ... a-tab.html
Regards,
Cosmin