Hi Samuel,
The error message is definitely concerning, we had clients run into the same thing when it was first released. However the AP 8.1F release notes say it is compatible with EFT 8.1E, so it is a false warning message.
You can check in an earlier thread here where Andrew confirmed it:
http://softrak.com/ubbthreads/ubbthreads...nstal#Post39190Cheers,
Lauren