Are you only having this problem with setup-files that themselves need to be updated? What's supposed to happen in that case is that WeiDU tries to re-launch itself, with the new process replacing the existing one. From the log trail, it seems like maybe this is happening, but that something goes wrong in the new process. Unfortunately, this is not something I am able to reproduce myself, so I don't know what would be going wrong. FWIW, the fall-back solution for the re-launch not working is telling the user to do it manually.