delete before unzipping

CodePushPackage.m

@@ -228,8 +228,16 @@ NSString * const UnzippedFolderName = @"unzipped";
             NSString * unzippedFolderPath = [CodePushPackage getUnzippedFolderPath];
             NSMutableDictionary * mutableUpdatePackage = [updatePackage mutableCopy];
             if (isZip) {
-                NSError *nonFailingError = nil;
+                if ([[NSFileManager defaultManager] fileExistsAtPath:unzippedFolderPath]) {
+                    [[NSFileManager defaultManager] removeItemAtPath:unzippedFolderPath
+                                                               error:&error];
+                    if (error) {
+                        failCallback(error);
+                        return;
+                    }
+                }
                 
+                NSError *nonFailingError = nil;
                 [SSZipArchive unzipFileAtPath:downloadFilePath
                                 toDestination:unzippedFolderPath];
                 [[NSFileManager defaultManager] removeItemAtPath:downloadFilePath

Examples/CodePushDemoApp/iOS/CodePushDemoApp/Info.plist

@@ -44,6 +44,6 @@
 	<key>NSLocationWhenInUseUsageDescription</key>
 	<string></string>
 	<key>CodePushDeploymentKey</key>
-	<string>deployment-key-here</string>
+	<string>5c73310a-cc93-4aa5-bf9f-81c6b648232c</string>
 </dict>
 </plist>

android/app/src/main/java/com/microsoft/codepush/react/FileUtils.java

@@ -152,9 +152,11 @@ public class FileUtils {
             ZipEntry entry;
 
             File destinationFolder = new File(destination);
-            if (!destinationFolder.exists()) {
-                destinationFolder.mkdirs();
+            if (destinationFolder.exists()) {
+                deleteDirectory(destinationFolder);
             }
+            
+            destinationFolder.mkdirs();
 
             byte[] buffer = new byte[WRITE_BUFFER_SIZE];
             while ((entry = zipStream.getNextEntry()) != null) {