The build 285.0 (beta) 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. The individual installers for the exporters are not provided for this build yet.
Hopefully no bad issue, due to the holiday period we haven't been able to double-check everything and we won't be able to upload a new build before 2 weeks. Make backup copies of your MFA files before loading them with this version anyway, and in case of problem you can reinstall the build 284.10 or 283.5 (no need to uninstall first, just reinstall the patch of the build you want to reinstall).
Let us know if any problem, thanks!