I offer no guarantees that this will work, but Bill Li writes that he solved the problem with getting the Global Village 2.6.2 Update
to install over a 2.5.x version by using ResEdit to change the version number of all the component of GV 2.5.X to 2.6.0. He claims that you can then install the version 2.6.2 on the fake " GV 2.6.0" and that it "really works." It seems to me this could only work if the Updater actually replaces the existing files rather than modifying them. Maybe that's what it does.