It would be nice if you spend a bit more time on your installer for Resolume. I can't say how many folders of Resolume I have in my applications folder and how often I get to a gig, click on Arena and start playing - with an old version of Resolume - and when I do realise and switch it doesn't have any of the plugins I've installed there.
At the very least it would be good if the Resolume/Arena installer offered to import the previous versions plugins and replace the dock icon. At the best you would have a current 'Resolume Arena' Application folder with older versions automagically being put in the same named folder but with the version number after it.