Can't update Android Studio - no “Update and Restart” button

Question

My Android Studio (0.4.3 now) often displays a message that is ready to update, but the alert does not have an \"Update and Restart\" button:

Answer 1

Actually this issue is kind a bug not really a bug :). This is what you need to do

When an update is available, you'll see a balloon notification in the IDE.

Two important known issues:

1. The first time, you'll see a dialog that asks you to accept this channel. You need to press "More info" to accept this channel, otherwise you won't get notified about updates.

2. If you press the "Ignore This Update" button, there is currently no mechanism available to revert that decision and Android Studio will never tell you about that update ever again.

For more info. visit : Android Tools Project Site

below is snap from android tools official site