The newest version of Derfin MP3 Downloader will be available with the next few hours on Google Play.
This new version includes new icons for the app and a work around for a very common crash. The work around is fully functional but will only be present until version 2.0 on which we are already working.
The crash was caused an incorrect implantation of a system API and was triggered by clicking on the download notification if more than one download was running at the time. If only one download was running, the app worked as expected. Also, the crash only crashed the app but not the download manager, which means that downloads continued after the app crash.