Im not sure what you mean by “tick”. But Android Studio is one thing, you need the Android SDK as well and the AVD which is the simulator is a third piece. Otherwise you can just dl AS and it will ask to the download the SDK as soon as you try to create a project that complies with a certain SDK.
It shouldnt matter whether you had AS installed on your computer before. Im assuming youre downloading 2.0, or 2.2?