"Bug 44161 - Wrong link to Extensions Website in 'Options' ... 'Get more dictionaries online...'" showed up a difference between older LibO versions, what link to
and Master / 3.5.0, what links to
in menu 'Tools -> Options -> Language Settings -> Writing Aids -> Edit'
We need to keep those downloads running also for older versions, and I would prefer to avoid to many special cases the Extensions server will have to handle. So I recommend to modify back to <http://extensions.libreoffice.org/dictionary/>
But of course, the only really important condition is that it works for all versions.
Currently everything works fine because Florian added filter rules for both URLs on the server
Fixed in 3.4 branch: http://cgit.freedesktop.org/libreoffice/components/commit/?h=libreoffice-3-4&id=4073928dfd787ed805105f7ab2d5cfed5bb3393c
Not sure if going to 3.4.5 branch as with Florian's fix to the website, this is less important. Changing to status fixed as seems the problem is fixed (one way or another).