Ok. I have created a new version of the all-in-one installer which contains the 2.12.1 version as the default iRex version. It also contains another version called 'fullscreen-nojump' which is identical to jharker's fullscreen version except that the 5-page jump that was activated by a long flip has been removed. I created this because I was a little tired of the flipbar doing 5 page turns when I only wanted one. I think a few other people might find this useful. This version was graciously produced by Fellbell and all I did was strip the binary produced by him so that it was of a smaller size (the original binary he produced was 1.1MB!).
As before, please do backup your current ipdf before installing anything.