diff --git a/android/src/main/java/org/hstar/reactnative/esayupgrade/IORejectionException.java b/android/src/main/java/org/hstar/reactnative/esayupgrade/IORejectionException.java
new file mode 100644
index 0000000..b44abc7
--- /dev/null
+++ b/android/src/main/java/org/hstar/reactnative/esayupgrade/IORejectionException.java
@@ -0,0 +1,14 @@
+package org.hstar.reactnative.esayupgrade;
+
+public class IORejectionException extends Exception {
+    private String code;
+
+    public IORejectionException(String code, String message) {
+        super(message);
+        this.code = code;
+    }
+
+    public String getCode() {
+        return code;
+    }
+}
diff --git a/android/src/main/java/org/hstar/reactnative/esayupgrade/RNEasyUpgradeModule.java b/android/src/main/java/org/hstar/reactnative/esayupgrade/RNEasyUpgradeModule.java
index cdcfca7..c6e2ae5 100644
--- a/android/src/main/java/org/hstar/reactnative/esayupgrade/RNEasyUpgradeModule.java
+++ b/android/src/main/java/org/hstar/reactnative/esayupgrade/RNEasyUpgradeModule.java
@@ -16,9 +16,9 @@
 import android.support.v4.util.LongSparseArray;
 import android.util.Log;
 import com.facebook.react.bridge.*;
+import org.hstar.reactnative.esayupgrade.IORejectionException;
 
-import java.io.File;
-import java.io.FileNotFoundException;
+import java.io.*;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -63,7 +63,6 @@ public String getName() {
         return "RNEasyUpgrade";
     }
 
-
     BroadcastReceiver downloadReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
@@ -87,6 +86,19 @@ public void onReceive(Context context, Intent intent) {
         }
     };
 
+    private Uri getFileUri(String filepath) throws IORejectionException {
+        Uri uri = Uri.parse(filepath);
+        if (uri.getScheme() == null) {
+            // No prefix, assuming that provided path is absolute path to file
+            File file = new File(filepath);
+            if (file.isDirectory()) {
+                throw new IORejectionException("EISDIR", "EISDIR: illegal operation on a directory, read '" + filepath + "'");
+            }
+            uri = Uri.parse("file://" + filepath);
+        }
+        return uri;
+    }
+
 
     @ReactMethod
     public void download(String url, ReadableMap headers, ReadableMap config, Callback onDone) {
@@ -163,6 +175,108 @@ public void isFileExists(String filepath, Promise promise) {
         }
     }
 
+    @ReactMethod
+    public void moveFile(String filepath, String destPath, Promise promise) {
+        try {
+            File externalStorageDirectory = Environment.getExternalStorageDirectory();
+            if (externalStorageDirectory != null && !filepath.contains(externalStorageDirectory.getAbsolutePath())) {
+                filepath = externalStorageDirectory.getAbsolutePath() + filepath;
+                destPath = externalStorageDirectory.getAbsolutePath() + destPath;
+            }
+
+            File inFile = new File(filepath);
+
+            if (!inFile.renameTo(new File(destPath))) {
+                copyFile(filepath, destPath);
+                inFile.delete();
+            }
+
+            promise.resolve(true);
+        } catch (Exception ex) {
+            ex.printStackTrace();
+            reject(promise, filepath, ex);
+        }
+    }
+
+    @ReactMethod
+    public void copyFile(String filepath, String destPath, Promise promise) {
+        try {
+            copyFile(filepath, destPath);
+
+            promise.resolve(null);
+        } catch (Exception ex) {
+            ex.printStackTrace();
+            reject(promise, filepath, ex);
+        }
+    }
+
+    @ReactMethod
+    public void unlink(String filepath, Promise promise) {
+        try {
+            File file = new File(filepath);
+
+            if (!file.exists()) throw new Exception("File does not exist");
+
+            DeleteRecursive(file);
+
+            promise.resolve(null);
+        } catch (Exception ex) {
+            ex.printStackTrace();
+            reject(promise, filepath, ex);
+        }
+    }
+
+    private void DeleteRecursive(File fileOrDirectory) {
+        if (fileOrDirectory.isDirectory()) {
+            for (File child : fileOrDirectory.listFiles()) {
+                DeleteRecursive(child);
+            }
+        }
+
+        fileOrDirectory.delete();
+    }
+
+    private void copyFile(String filepath, String destPath) throws IOException, IORejectionException {
+        InputStream in = getInputStream(filepath);
+        OutputStream out = getOutputStream(destPath, false);
+
+        byte[] buffer = new byte[1024];
+        int length;
+        while ((length = in.read(buffer)) > 0) {
+            out.write(buffer, 0, length);
+        }
+        in.close();
+        out.close();
+    }
+
+    private InputStream getInputStream(String filepath) throws IORejectionException {
+        Uri uri = getFileUri(filepath);
+        InputStream stream;
+        try {
+            stream = reactContext.getContentResolver().openInputStream(uri);
+        } catch (FileNotFoundException ex) {
+            throw new IORejectionException("ENOENT", "ENOENT: no such file or directory, open '" + filepath + "'");
+        }
+        if (stream == null) {
+            throw new IORejectionException("ENOENT", "ENOENT: could not open an input stream for '" + filepath + "'");
+        }
+        return stream;
+    }
+
+    private OutputStream getOutputStream(String filepath, boolean append) throws IORejectionException {
+        Uri uri = getFileUri(filepath);
+        OutputStream stream;
+        try {
+            stream = reactContext.getContentResolver().openOutputStream(uri, append ? "wa" : "w");
+        } catch (FileNotFoundException ex) {
+            throw new IORejectionException("ENOENT", "ENOENT: no such file or directory, open '" + filepath + "'");
+        }
+        if (stream == null) {
+            throw new IORejectionException("ENOENT", "ENOENT: could not open an output stream for '" + filepath + "'");
+        }
+        return stream;
+    }
+
     private void rejectFileNotFound(Promise promise, String filepath) {
         promise.reject("ENOENT", "ENOENT: no such file or directory, open '" + filepath + "'");
     }
diff --git a/index.js b/index.js
index 2214362..dc6abd4 100644
--- a/index.js
+++ b/index.js
@@ -19,6 +19,7 @@ const defaults = {
   downloadDestDirectory: DocumentDirectoryPath,
   downloadApkName: DEFAULT_DOWNLOAD_APK_NAME,
   downloadApkEnd: path => RNEasyUpgrade.installApk(path),
+  shouldCheckApkHasDownloaded: true,
   onError: () => {}
 };
 
@@ -73,10 +74,13 @@ class AppUpgrade {
       return;
     }
 
+    const tempDownloadApkName = 'temp_download.apk';
+    const tempDownloadPath = this.downloadDestDirectory + '/' + tempDownloadApkName;
+
     const downloadConf = {
       downloadTitle: this.options.downloadTitle,
       downloadDescription: this.options.downloadDescription,
-      saveAsName: this.options.downloadApkName,
+      saveAsName: this.options.shouldCheckApkHasDownloaded ? tempDownloadApkName : this.options.downloadApkName,
       allowedInRoaming: true,
       allowedInMetered: true,
       showInDownloads: true,
@@ -85,8 +89,11 @@ class AppUpgrade {
     };
     jobId = 1;
     download(apkUrl, downloadConf)
-      .then(res => {
+      .then(async res => {
         jobId = -1;
+        if (this.options.shouldCheckApkHasDownloaded) {
+          await RNEasyUpgrade.moveFile(tempDownloadPath, this.downloadDestPath);
+        }
         this.options.downloadApkEnd(this.downloadDestPath);
       })
       .catch(err => {
@@ -132,9 +139,9 @@ class AppUpgrade {
     RNEasyUpgrade.openURL(trackViewUrl || this.trackViewUrl);
   }
 
-  startAppUpdate(apkUrl, appStoreUrl = this.trackViewUrl, options = { checkApkHasDownloaded: true }) {
+  startAppUpdate(apkUrl, appStoreUrl = this.trackViewUrl) {
     if (isAndroid) {
-      if (options.checkApkHasDownloaded) {
+      if (this.options.shouldCheckApkHasDownloaded) {
         this.checkApkHasDownloaded().then(async hasDownloaded => {
           if (hasDownloaded) {
             this.options.downloadApkEnd(this.downloadDestPath);