I was installing Android SDK and was downloading the required packages, and while installing, my Anti-virus, restarted my laptop.
When I rebooted the laptop and tried downloading the remaining packages, I got this error “Done. Nothing was installed.”
I searched for the solution for the problem and found that if we run “sdk manager” as administrator, and, follow the normal steps, then this problem is resolved.
You can start the sdk manager by typing “sdk manager” in the start menu and follow the step mentioned above. 🙂