I just found where to download it with a good quality
so I'm sharing the link in case someone didn't find where to download it
http://arearaw.com/dvdrip-%E3%82%82%EF%BD%9E%E3%81%A3%E3%81%A8-%E3%81%8A%E3%82%B8%E3%83%A3%E9%AD%94%E5%A5%B3%E3%81%A9%E3%82%8C%E3%81%BF-motto-ojamajo-doremi-12-25g/#
Plz use the "uploadable" links, cause the others won't work