If you need any old release of Mogre SDK then you can find it here.
You can also go to Mogre Sourceforge releases
or the home of MogreSDK on code.google.com. What's the difference??
MOGRE 0.2.3 Lite + OGRE 1.4.5 SDK installer
MOGRE 0.2.3 Lite + OGRE 1.4.5 SDK installer with Unicode Support
(mogre 0.2.3 Lite Does NOT include media and samples, for the moment use the ones on the Mogre 0.2.2 installer)