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CCS: CCSv6/7: can't install earlier version of compiler than what is installed

Tool/software: Code Composer Studio

When I recently installed CCSv7, I picked the latest version of the MSP430 Compiler Tools we are using (4.4.8). We have some builds that use earlier versions of the compiler (4.4.7), but when I tried to install it via Help->Install New Software, Work with All Available Sites, and then checking the box on MSP430 Compiler Tools Version 4.4.7, I end up getting an error with details of "MSP430 Compiler Tools" will be ignored because a newer version is already installed". The same thing happens in CCSv6. Do I need to uninstall all compiler versions and start installing from the oldest first?