how can I safely remove old versions of Opera?
If I want to install an older version of Opera I can go to http://ftp.opera.com/pub/opera/desktop/ and install it. I then change the path to install it. How do I make sure that it does not auto update and how should I uninstall it so that I don't lose all of my settings and yet don't have redundant files on my desktop?
For example let's say I install Opera 29 (older) next to Opera 30 (stable). I test it out compared to the current version of Opera (30) and then I uninstall it. I am asked if I want to "Delete my Opera User data." I do want to delete it if it is opera 29 user data, but not if it is opera 30 data. If the user data is used by both Opera 29 and 30 then I do not want to remove it.
On a side note it appears that beta and developer versions of opera use different user data sets.