LanMinchang reports on twitter:
There is a bug. When installing, the package will not replace existing file, such as voukoderplug.dll , voukoder.dll and voukoder.tlb.
Does that happen to anybody else?
If this is the case, please run the installer with this command line using the windows command prompt. (Replace that values in brackets with the actual filenames of course)
And share that logfile here.