I have no clue what jboy is referring to above: I installed this offer and so far it looks promising, but this promo edition states clearly that there is no registration (unless there turns out to be one buried somewhere in the Windows Registry, which I suppose is quite possible), and therefore no license key which could be applied to the portable version. Even if it was allowed, there would not be much point in having the installed version side-by-side on the same computer along with the portable one. The main point of portable apps is that you are able to take them with you and run them from a flashdrive.