Loading SDK information... Refresh Sources: Fetched Add-ons List successfully Refresh Sources Installing Archives: Preparing to install archives Downloading SDK Platform Android 4.4W, API 20, revision 1 Installing SDK Platform Android 4.4W, API 20, revision 1 Failed to rename directory C:\android-studio\sdk\platforms\android-20 to C:\android-studio\sdk\temp\PlatformPackage.old01. SDK Manager: failed to install -= Warning ! =- A folder failed to be moved. On Windows this typically means that a program is using that folder (for example Windows Explorer or your anti-virus software.) Please momentarily deactivate your anti-virus software or close any running programs that may be accessing the directory 'C:\android-studio\sdk\platforms\android-20'. When ready, press YES to try again. Note: you can use --force to override to yes. [y/n] => Done. Nothing was installed.