I attempted to do as you said... enable the FTP layer and received "An error has occurred.
0 Could not write to the configuration file
Return to Control Panel"
I then ran the "Fix Permissions" Tool in Admin Tools, which fixed that problem, but while attempting to install the latest Akeeba Backup from a local file I received:
Warning
JFTP: :mkdir: Bad response
JFTP: :chmod: Bad response
JFTP: :store: Bad response
Warning: Failed to move file!
Error
There was an error uploading this file to the server.
Path does not have a valid package.
Any suggestions?