If you keep multiple copies of Cura around, please keep in mind the following:
The settings and machine profiles are not all the same across the lot of them unless you make sure they are.
You might want to keep links/executables for the different copies of Cura in different parts of the desktop to keep the tuned settings away from the untuned settings.
I imagine this is also relevant when you have multiple copies of other slicers on hand. I just realized how different my machine profiles and other slicer settings were. No wonder my first layer porn looked like someone shit the bed. I forgot that I never tuned in the version of Cura that I was using.