I just stepped in kcontrol over the URL leading http://themes.kde.org again. http://themes.kde.org redirects to https://store.kde.org/ - if you try to find a working theme for TDE, you have to look very hard. But https://www.trinity-look.org/ (served from the same server) gives the correct category.
I've added 2 patches, one for kcontrol, the second for the tabbedbrowsing profile to replace these URLS. In tabbedbrowsing I also changed the URLS from KDE internals to TDE mainsite and TDE wiki.
Would it be possible to change this cosmetic anoyance in the next release?
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