Hi,
I'm using CCS 5.4.0.00091 (Win7-32). So far I always was able to download and update MSP430 code generation tools through Help -> Check for Updates or to upgrade to new minor releases through Help -> Install New Software... .
I tried to get the new MSP430 CGT 4.2.x minor releases but they are not shown? (http://processors.wiki.ti.com/index.php/Production_Compiler_Releases)
Best regards,
Christian