I want to use the latest Opera browser, but v12 does not have opera-unite anymore. So, I would like to use a "portable" v11 Opera (v11 has unite).

(By portable I mean a program with all files within a certain directory that can be put in any place on the hard drive or on an external drive, a program that can be started by running an executable file from the same directory, and which can be run separately of other installed versions of the same program.)