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In which case does the installer want to install Java, even if Java is already installed?

The PlayCatan Access Software (formerly: COW client) is a 32-bit program and needs the 32-bit Java version. If only the 64-bit Java version is installed on a 64-bit operating system like Windows Vista 64-bit, the installer will install the 32-bit Java version additionally. The 64-bit Java version can be used further on by 64-bit programs.