New version at:
http://download.kde.org/stable/kdiagram/2.6.3/kdiagram-2.6.2.tar.xz.mirrorlist

Signed with key:
https://share.kde.org/index.php/s/pYwk5c7UNcXGYfP
Fingerprint:
42A6 0D06 F449 E895 F40F  09C0 1638 B8A6 1610 8B8A
-- 
Cheers,

Dag