If you want to install IntelliType using the msi contained in one of the subfolders of the installation, you will get an error saying that you must use the setup.exe, which is not able to install it silent. So I used this command line:
msiexec.exe /i "itp.msi" BUNDLE=1 REBOOT=ReallySuppress INSTALLGUID="{8979881A-8E43-467f-B387-E37B914A0E53}"
It does make sense to check if the GUID is the correct one (search msi file with Orca). Also use appropriate mst file if you are not installing in english language. The mst is located in the same folder as the itp.msi.
If you want to add a mst-file you have to add TRANFORMS=10xx.mst to the command line
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