After downloading, make sure you have enough free disk space (at least more than twice the download file size) for installing the programs.Create a save destination folder for the file downloads onto your main hard drive.
Regarding the malfunction of the installation to OS X v10.8 or later, please refer to 'I cannot install the software downloaded from the web site onto OS X v10.8 or later'.
MacS1500ManagerV32L80WW.dmg (482.6MB) Download Instructions ScanSnap Manager for Mac (V3.2L80) Setup Program