Android Studio Gradle issue upgrading to version 0.5.0 - Gradle Migrating From 0.8 to 0.9 - Also Android Studio upgrade to 0.8.1

Question

After upgrade message states:

Failed to refresh Gradle project \'XXX\'
The project is using an unsupported version of the Android Gradle plug-in (0.8.3).
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Answer 1

I had the same error, but already had

classpath 'com.android.tools.build:gradle:0.9.+'

set like this, as Cedric Simon suggested. Thanks to the comment of mattblang, I tried to change it to 0.9.0 and refreshed it

for those who don't know, where the refresh button is, look below:

Afterwards I tried what happens when I change it back to 0.9.+ and refresh again...and it still works.

So I assume, only pressing the refresh button would have sufficed.