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That sounds a little weird but you can go to Settings - Apps / (Samsung) Applications Manager, and scroll across to the 4th 'All' list, and 5th Turned Off (Disabled) list.
If the App is in the All list, it is already Turned On (Enabled).
If you had tried to Turn Off a stock app like Google Play Services, you would have to uninstall updates before Turning Off or Force Stopping.
So three apps are related:
Ensure Google Play Store, Google Play Services and Download Manager are enabled / Turned on.
If you have to turn on Google Play Services, it should update itself.
My UK Samsung labels Turned Off as Disabled. I am guessing you have a Samsung with the US setting name.


