UPDD commander is now part of ActiveInspire. You need it. Newer versions of macOS have tighter security.  If you use an older version of ActiveInspire, it either won't run on your updated machine or it will error at times. You need the new Inspire which has a bright orange icon. 

The next section involves which of version of macOS you have.

If you have System Preferences

Go to System Preferences and then click on Security & Privacy. If you can't find it, use the search bar at the top and type in Privacy. Then click on the indicated Security & Privacy option. Skip the following section and look for the heading called Next Steps.

If you have System Settings

Go to System Settings and click on Privacy & Security. If you can't find it, use the search bar at the top and type in Privacy. Then click on the indicated Privacy & Security option.

Next Steps

Depending on the version of MacOS you upgraded to, you may have a series of tabs, the left-most tab being a General tab; if so, click on it. If the Security & Privacy icon is a hand on a blue background, you won't have a General tab.

Look for a section near the bottom called "Allow applications download from"; earlier operating sytems used "Allow apps download from".

You should see an Allow button that needs to be clicked. If it is grayed out, look for a golden padlock. Clicking the padlock will prompt you to sign in with the teacher account and the teacher password. Just above the padlock will be an Allow button; click on it.

If you have tabs, click on the Privacy tab.

The next section you need is Accessibilty. 

Find the two UPDD items under accessibility and place check marks by them.

If it is grayed out, look for a golden padlock. Clicking the padlock will prompt you to sign in with the teacher account and the teacher password. Then place the checkmarks.

You can now close out of System Preferences.