Occasionally the dell command update service that the command update app uses will become disabled. There are two ways to fix this. Easiest way is to restart the service. Other way is to uninstall and reinstall. 

To restart the service:

Go to the windows search bar and type services, and open up the app:

Look for the service called "Dell Client Management Service". Right click on it. If you can hit restart (if its not greyed out) do so and check that the status has changed to "running". If so you are done. That is likely not the case, so instead of hitting restart hit properties:

Then, change startup type to automatic. Hit Apply and ok. Now go back to services and check that the status has changed to running. You may need to re-open services but after that you should see the service running and you should now be able to run dell command.

If that does not work, to uninstall and reinstall:

Type control panel in the search bar and open the control panel

click uninstall a program. This will either be under programs as shown, or under "programs and features" 

then look for "dell command update". Click it and press uninstall. There will likely be multiple dell options so make sure to remove that one. It may take a bit where it looks like nothing is happening (just a few minutes). You can in the same manner, close and reopen the control panel and go back to uninstall a program and it will be gone. It is a good idea to confirm dell command is no longer listed there. 

Then to redownload, go to this link.

From there, go down to where it says download and hit download

From there, click the notification for the exe file or click the down arrow downloads icon and click there. From there run the installer and follow the prompts. When finished, you will get a complete message that you can then close. check out the below article for how to use the software once installed:

Dell Command Updates