I then downloaded LanguageTool-2.6.oxt and tried to install it via Extension Manager.
It shows around 3% progress but then all LibreOffices UI and processes freeze (Not responding).
Sabrina, sorry you’re having problems with LT. Did you try this just once? If so, I’d suggest to simply try it again… that’s all I can suggest for now, as I cannot remember that we had such a bug report before.
I tried it once with the English UI, once in German… The German Extension Manager produced some UI glitches with text being too long and overlapping with other text but apart from that, same behaviour librOffice wise… Freeze.
This is supposed to work with portable installs, right? Any known version conflicts?
I’m not aware of any problems with LT and portable LibreOffice, but I also have no reports that it’s actually working. The other thing you could try is running LibreOffice from console to see if it prints any messages when freezing. Also, LibreOffice portable 4.3.0 has been released just yesterday, you might want to try that, too.