We've just pushed Android Studio 2.1 Preview 4 to the canary channel. This build incorporates more bug fixes for Instant Run. There are a couple of small UI changes: there is a "Rerun" action in the toolbar next to run, which lets you build and restart the process with one click (or keyboard shortcut). And in the Build menu there is a "Clean Rerun" action which performs a full clean, build, install and run.
You can update your current 2.0 or 2.1 Preview installation to 2.1 Preview 4 via the built-in patch mechanism (Check for Updates). Make sure you switch to the Canary channel, if necessary.
You can also update from 1.5 to 2.1 Preview 4 via the patch mechanism, but you may not want to do that: See our page about how to keep multiple installations simultaneously while Studio is in preview mode.
You can also download a full zip of 2.1 Preview from the Android Studio 2.1 Preview 4 page.
If you run into problems, be sure to check the Known Issues page which we'll update as necessary.
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