This seems to be a permissions issue on your computer. To rule it out, first quit out of InDesign. Next, within your 'Applications' folder, navigate to the 'Adobe InDesign CC 2017' folder (or whichever InDesign version you're on), select it and hit 'command' + 'i' (Get Info).
If you take a look at the attached screenshot ('Permissions - InDesign CC Folder.jpg') below, you need to make sure that it's set to 'Read & Write' and also make sure to select 'Apply to enclosed items...' too, as this will also set everything within that folder as well.
Once that is done, re-run the installer ('.dmg') once more, finish the install of the tools, re-open InDesign and let us know if that fixes it for you afterward.
Hope this helps.