I’ve been a long time user of CiderPress for Windows to manage images for my Apple II computers. But, it required me to run Parallels for macOS. [ since I haven’t permitted Windows computers among family members since 2005; I got tired of fixing everyone’s issues ]. So, when this popped up I jumped at it. Straight download, app lands on desktop and off you go. So far, it’s down everything I’ve needed. I’m running macOS Sierra in case you need that for reference.