We have updated the links on the Wiki and an the 0.6.2 announcement page. The original issue CEGUI 0.6.2 files (non 'b' versions) are being withdrawn.
Anybody who has the original 0.6.2 release version of CEGUI is encouraged to dump it it favour of the 0.6.2b versions. If you're using the lua scripting module at all, it is imperative that you do this, since the module in the original 0.6.2 issue is highly volatile (it will release lua function references out from underneath you!).
Sorry for the inconvenience, and we hope that the newly issued files will have less problems