diff --git a/app/src/main/java/org/fdroid/fdroid/installer/DefaultInstaller.java b/app/src/main/java/org/fdroid/fdroid/installer/DefaultInstaller.java
index b25009ffc..34c214a88 100644
--- a/app/src/main/java/org/fdroid/fdroid/installer/DefaultInstaller.java
+++ b/app/src/main/java/org/fdroid/fdroid/installer/DefaultInstaller.java
@@ -27,7 +27,6 @@ import android.content.pm.PackageManager;
 import android.net.Uri;
 
 import java.io.File;
-import java.util.List;
 
 /**
  * For Android < 4: Default Installer using the public PackageManager API of
@@ -61,11 +60,6 @@ public class DefaultInstaller extends Installer {
         }
     }
 
-    @Override
-    protected void installPackageInternal(List<File> apkFiles) throws AndroidNotCompatibleException {
-        // not used
-    }
-
     @Override
     protected void deletePackageInternal(String packageName) throws AndroidNotCompatibleException {
         try {
@@ -103,10 +97,4 @@ public class DefaultInstaller extends Installer {
                 return false;
         }
     }
-
-    @Override
-    public boolean supportsUnattendedOperations() {
-        return false;
-    }
-
 }
diff --git a/app/src/main/java/org/fdroid/fdroid/installer/DefaultSdk14Installer.java b/app/src/main/java/org/fdroid/fdroid/installer/DefaultSdk14Installer.java
index b498a8076..6f4d18f4d 100644
--- a/app/src/main/java/org/fdroid/fdroid/installer/DefaultSdk14Installer.java
+++ b/app/src/main/java/org/fdroid/fdroid/installer/DefaultSdk14Installer.java
@@ -29,7 +29,6 @@ import android.net.Uri;
 import android.os.Build;
 
 import java.io.File;
-import java.util.List;
 
 /**
  * For Android >= 4.0: Default Installer using the public PackageManager API of
@@ -73,11 +72,6 @@ public class DefaultSdk14Installer extends Installer {
         }
     }
 
-    @Override
-    protected void installPackageInternal(List<File> apkFiles) throws AndroidNotCompatibleException {
-        // not used
-    }
-
     @Override
     protected void deletePackageInternal(String packageName) throws AndroidNotCompatibleException {
         try {
@@ -129,10 +123,4 @@ public class DefaultSdk14Installer extends Installer {
                 return false;
         }
     }
-
-    @Override
-    public boolean supportsUnattendedOperations() {
-        return false;
-    }
-
 }
diff --git a/app/src/main/java/org/fdroid/fdroid/installer/Installer.java b/app/src/main/java/org/fdroid/fdroid/installer/Installer.java
index e038ae7bf..c12bf9667 100644
--- a/app/src/main/java/org/fdroid/fdroid/installer/Installer.java
+++ b/app/src/main/java/org/fdroid/fdroid/installer/Installer.java
@@ -30,7 +30,6 @@ import org.fdroid.fdroid.Utils;
 import org.fdroid.fdroid.privileged.install.InstallExtensionDialogActivity;
 
 import java.io.File;
-import java.util.List;
 
 /**
  * Abstract Installer class. Also provides static methods to automatically
@@ -53,20 +52,9 @@ public abstract class Installer {
 
         private static final long serialVersionUID = -8343133906463328027L;
 
-        public AndroidNotCompatibleException() {
-        }
-
-        public AndroidNotCompatibleException(String message) {
-            super(message);
-        }
-
         public AndroidNotCompatibleException(Throwable cause) {
             super(cause);
         }
-
-        public AndroidNotCompatibleException(String message, Throwable cause) {
-            super(message, cause);
-        }
     }
 
     /**
@@ -175,18 +163,6 @@ public abstract class Installer {
         installPackageInternal(apkFile);
     }
 
-    public void installPackage(List<File> apkFiles) throws AndroidNotCompatibleException {
-        // check if files exist...
-        for (File apkFile : apkFiles) {
-            if (!apkFile.exists()) {
-                Log.e(TAG, "Couldn't find file " + apkFile + " to install.");
-                return;
-            }
-        }
-
-        installPackageInternal(apkFiles);
-    }
-
     public void deletePackage(String packageName) throws AndroidNotCompatibleException {
         // check if package exists before proceeding...
         try {
@@ -218,13 +194,8 @@ public abstract class Installer {
     protected abstract void installPackageInternal(File apkFile)
             throws AndroidNotCompatibleException;
 
-    protected abstract void installPackageInternal(List<File> apkFiles)
-            throws AndroidNotCompatibleException;
-
     protected abstract void deletePackageInternal(String packageName)
             throws AndroidNotCompatibleException;
 
     public abstract boolean handleOnActivityResult(int requestCode, int resultCode, Intent data);
-
-    public abstract boolean supportsUnattendedOperations();
 }
diff --git a/app/src/main/java/org/fdroid/fdroid/installer/PrivilegedInstaller.java b/app/src/main/java/org/fdroid/fdroid/installer/PrivilegedInstaller.java
index f447b29e4..887115124 100644
--- a/app/src/main/java/org/fdroid/fdroid/installer/PrivilegedInstaller.java
+++ b/app/src/main/java/org/fdroid/fdroid/installer/PrivilegedInstaller.java
@@ -44,7 +44,6 @@ import org.fdroid.fdroid.privileged.views.AppSecurityPermissions;
 import org.fdroid.fdroid.privileged.views.InstallConfirmActivity;
 
 import java.io.File;
-import java.util.List;
 
 /**
  * Installer based on using internal hidden APIs of the Android OS, which are
@@ -237,12 +236,6 @@ public class PrivilegedInstaller extends Installer {
                 Context.BIND_AUTO_CREATE);
     }
 
-    @Override
-    protected void installPackageInternal(List<File> apkFiles)
-            throws AndroidNotCompatibleException {
-        // not used
-    }
-
     @Override
     protected void deletePackageInternal(final String packageName)
             throws AndroidNotCompatibleException {
@@ -368,11 +361,6 @@ public class PrivilegedInstaller extends Installer {
         }
     }
 
-    @Override
-    public boolean supportsUnattendedOperations() {
-        return false;
-    }
-
     public static final int INSTALL_REPLACE_EXISTING = 2;
 
     /**