Hi Puma,
firstly I moved your topic to Locus -> Question forum from Smartmaps forum.
then, to remove adds you just look into settings, there is possibility to disable by checkbox button.
and about downloaded maps - it depend on method you used for download.
Here are described method of download. If you choose first one, there will be no new map in custom maps tab. This method share tiles with online maps, so you just select Google earth from online maps, and your downloaded tiles will be used!