While many Tivoli products use the InstallShield Multi-Platform (ISMP) installer, TCR uses Zero G installer.
This little difference is important if you want to reinstall the product. Specifically, ISMP uses the vpd.properties file as its installation registry. Zero G, on the other hand, uses a file named .com.zerog.registry.xml (notice that it begins with a dot, so it's a hidden file). So if you need to delete the product and start over, you need to edit or delete this file, also. If you only remove the install directory, when you run the installer, it will just tell you that Tivoli Common Reporting is already installed, and won't reinstall it.