When starting the install routine of ctrlX WORKS you can decide if you want to do a parallel installation or an update of the older one. So both is possible. As your ctrlX CORE as well as your PC software should have the actual release I recommend an update.
When opening a program in CtrlX PLC Engineering that was written in an older version, it asks you if the targets and libraries should get updated. Also here I recommend to do that.
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