Upgrade SQL Server 2008 to 2008 R2
I have currently installed SQL Server 2008 (dev edition) in my machine. I wish to upgrade to SQL Server 2008 R2. How is that possible? 

Please support the same with screenshot to make understanding better.

Thanks
Upgrade SQL Server 2008 to 2008 R2
===

I have currently installed SQL Server 2008 (dev edition) in my machine. I wish to upgrade to SQL Server 2008 R2. How is that possible? 

Please support the same with screenshot to make understanding better.

Thanks