diff --git a/NSMBe5/Plugin/PluginManager.cs b/NSMBe5/Plugin/PluginManager.cs
index fb78072..ce4c6b3 100644
--- a/NSMBe5/Plugin/PluginManager.cs
+++ b/NSMBe5/Plugin/PluginManager.cs
@@ -38,7 +38,7 @@ public static int LoadPlugin(string pluginPath)
 			Assembly pluginAsm;
 			Type pluginClass;
 			string pluginName;
-
+			
 			try
 			{
 				pluginAsm = Assembly.LoadFile(pluginPath);
diff --git a/NSMBe5/Plugin/PluginSelector.cs b/NSMBe5/Plugin/PluginSelector.cs
index 468f55e..d94d628 100644
--- a/NSMBe5/Plugin/PluginSelector.cs
+++ b/NSMBe5/Plugin/PluginSelector.cs
@@ -67,9 +67,17 @@ private void installButton_Click(object sender, EventArgs e)
 
 			foreach (string path in dialog.FileNames)
 			{
-				string dest = System.IO.Path.Combine(pluginPath, System.IO.Path.GetFileName(path));
+				string file = System.IO.Path.GetFileName(path);
 
-                System.IO.File.Copy(path, dest);
+				string dest = System.IO.Path.Combine(pluginPath, file);
+
+				if (System.IO.File.Exists(dest))
+				{
+					MessageBox.Show($"Plugin \"{file}\" already exists", "Plugin Selector", MessageBoxButtons.OK, MessageBoxIcon.Error);
+					continue;
+				}
+
+				System.IO.File.Copy(path, dest);
 
 				PluginManager.LoadPlugin(dest);
 			}