Downloading & Installing New RO & Sakray Versions

[Magister Magi]

They come out with new RO and Sakray versions twice a year (or is it more? I'm not too sure myself.), and I find myself in a bit of a dilemma.

I'm downloading the most recent versions of RO & Sakray, but I don't know if installing them without uninstalling my old RO and Sakray would be smart.

Should I uninstall everything (the entire contents of the Gravity folder on my comp) and then reinstall all of it, or can I just install the new versions now?

Also, would renaming the program once I've downloaded it cause it to be unusable (I admit, it's happened to me before for some strange reason)?

As always, any help would be greatly appreciated.