Did you ever get this resolved? We are having a similar issue.
Check that the version of the AFT module has been updated in CCM. If CCM version is still showing the old File Transfer version then run ctmgetcm on the Control-M Server to update the version.
I think this is how CCM decides which plugin to use and if it's not updated it uses the wrong plugin.
Failing that ensure that EM Client and EM Server have both been updated with new plugins.
Thanks for the reply Paul. Our issue is a bit different, everything shows version 7.0 but when trying to install the next patch it gives the same error that Darrin receives, only it references Installation not required. GA 7.00 not compatible. We are looking to sunset the server in question, so have decided to take no action.