This is a backport of the F-Droid Classic client (by Bubu) to pre-5.1. As of now, it is based on the latest version and is tested to work on as low as 4.3. It partially functions on 4.0, however doing virtually anything will either fail, look wrong, or crash the app.
This program is Free Software: You can use, study share and improve it at your will. Specifically you can redistribute and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.