Here's a sample silent command line with the prereqs installed (utilizing the tip in the Notes about removing iDesktop integration - in my case we are using Office 2010 which isn't compatible). This is for 64-bit hence the 64-bit msi is used. (%~dp0 variable used as a source directory variable since batch files have issues with UNC paths):
rem Install DirectX
rem Install Prereqs
msiexec /i "%~dp0prereq\ProjectWise Prerequisite Runtimes V8i (SELECTseries 3).msi" /quiet /norestart
rem Install main install with iDesktop integration to Office 2007 turned off (since Office 2007 is not available)
msiexec /i "%~dp0explorer\ProjectWise Explorer V8i (SELECTseries 3) (x64).msi" ADDLOCAL=ALL REMOVE=MSOFFICE /quiet /norestart
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