The build 285.8 is now the latest official version. The update patch is available in the Download Links post in the "Support Forums / Product Owner's Lounge / Fusion 2.5" forum.
The CF 2.5 patch updates all the installed exporters, you do not need to reinstall them.
In case of problem you can reinstall the build 284.10 or a previous beta version of the build 285 (no need to uninstall first, just reinstall the patch of the build you want to reinstall).
If any problem with this version, please post it in the bug box, don't post it in this forum otherwise the developers won't see it, thanks!