When you open the install dialog in Dependency Control on macOS it will automatically populate both dropdown boxes with the topmost option, instead of leaving them empty, as seen below:
https://cdn.discordapp.com/attachments/628307509953953792/633745957439143937/2019-10-15_21.20.03.png
Note that (AFAIK) it's also not possible to deselect a module or script. Not sure if this actually affects the installation in any way.