Important: With this release the extension name of the project has been renamed from the obsolete 'file_manager' to 'file_maintenance' so it matches the project name. The module needs to be re-enabled after upgrading. The best would probably be to uninstall 'file_manager' and reinstall 'file_maintenance'. Sorry for the inconvenience.
First dev release of version 7.x of file_maintenance. Version 7.x is a completely different piece of software written independently from the 6.x version.