The settings in Advanced Downloader for Mega let you choose the number of times the failed download can restart, as well as the maximum number of simultaneous downloads. You can also choose the folder where your downloads are saved and the maximum download speed.
Advanced Downloader for Mega is an excellent client for downloading MEGA links. The app takes up very little space, plus it has a minimalist interface that's super easy to use.
Requires Android 3.0 or higher