I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 24)

Readiris TM 14 – User Guide
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 Click Install to install the driver.
Note that an internet connection is required to complete this
operation.
Twain scanners
 Connect your scanner to your Mac and power it on.
 Install your scanner's Twain driver.
In general, drivers can be found on the CD-ROM provided with
your scanner and on the website of your scanner manufacturer.
They are not provided by I.R.I.S. Note that some scanner drivers
may not work under the latest versions of Mac OS. See the
documentation supplied with your scanner to find out which
platforms are supported. If necessary, contact your scanner
manufacturer.
IRIScan Express scanners
 Connect your IRIScan Express scanner to your Mac and power it
on.
 If Readiris is part of your IRIScan product, the driver has been
installed during the installation of Readiris.
If that is not the case, visit our website
www.irislink.com/support to download and install the required
driver.