The iTunes installer is architecture sensitive. It only allows the 32bit version of iTunes to install on 32bit OS's. This can be problematic with the package created by SVM, as the wizard in step 4 of 4 allows and defaults the system applicability to both 32-bit and 64-bit systems.
However, if you try to install the 32bit version of iTunes on a 64bit OS you may see this error.
You may see this in the SecuniaPackage.log:
Package architecture does not match system architecture. Aborting
