Is it possible to downgrade from ROS Jade to Indigo?
For those who are not yet familiar with Robot Operating System (ROS), here: ROS
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You can have Jade and Indigo installed in parallel on the same system and use each one individually with different projects.
Ask on answers.ros.org. Don't forget to tell them what OS & OS version you are using. Installing Indigo in parallel via manual installation should not present any problems. apt style installation depends on your OS & version.