You install just the MSI by:
msiexec /i caseware_wp_2011.msi /qb!
But in our company we needed a bit more and made a script to do this:
msiexec /i caseware_wp_2011.msi /qb! %programfolder%\caseware\pdfinst\install.exe -s
cacls "C:\casewarefolder\" /T /E /G everyone:f
REG IMPORT casesettings.reg
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