I cannot install the software downloaded from the web site onto OS X v10.8 or later.

As for OS X v10.8 or later, the following error message appears when trying to open the installer that was downloaded from the web site without the digital signature applied, so that it cannot be installed.
Once you've started 012-01
Note: Even when the digital signature is not applied to it, the error does not occur with the installer that is obtained from the Setup DVD or the online update it is performed with.

Follow the workaround below to start the installation.

Click the icon of the downloaded installer with the [Control] key held down and then select [Open] from the menu.
Once you've started 012-02

The warning message ""xxx" is from an unidentified developer. Are you sure you want to open it?" appears. ("xxxx" shows the filename of the installer.)
Click [Open] to start the installation.
Once you've started 012-03

Target ScanSnap:
S1100 / S1300i / S1300 / S1500 / S1500M / S300M / S510M

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