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In principle you can have multiple versions installed at the same time and this will work, as long as you take care that you only use one version (and packages for that version) at any time. This means the ROS_PACKAGE_PATH, setup.bash and everything else of only the ROS version you want to use might be active. Making a mistake here can lead to all sorts of errors. It's recommended to use only one version (a stable one) though, unless you have special needs.