We've just pushed Android Studio 2.0 beta 7 to the beta channel. Relative to beta 6 a few week ago, this fixes a few more user reported bugs related to Instant Run (in particular, faster builds on Windows, better support for multi-process apps, handle multiple activities better, and a few correctness fixes), as well as fixes to make the IDE run better on Windows.
You can update your current 2.0 Preview installation to 2.0 Beta 7 via the built-in patch mechanism (Check for Updates).
You can also update from 1.5 to 2.0 Beta 7 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 2.0 Beta from the Android Studio 2.0 Beta 7 page.
If you run into problems, be sure to check the Known Issues page which we'll update as necessary.
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