diff --git a/Flow.Launcher.Core/Plugin/PluginInstaller.cs b/Flow.Launcher.Core/Plugin/PluginInstaller.cs
index 4cdab09f9..e39c24430 100644
--- a/Flow.Launcher.Core/Plugin/PluginInstaller.cs
+++ b/Flow.Launcher.Core/Plugin/PluginInstaller.cs
@@ -29,7 +29,7 @@ public static class PluginInstaller
     {
         if (API.PluginModified(newPlugin.ID))
         {
-            API.ShowMsg(string.Format(API.GetTranslation("failedToInstallPluginTitle"), newPlugin.Name),
+            API.ShowMsgError(string.Format(API.GetTranslation("failedToInstallPluginTitle"), newPlugin.Name),
                     API.GetTranslation("pluginModifiedAlreadyMessage"));
             return;
         }
@@ -126,7 +126,7 @@ public static class PluginInstaller
 
         if (API.PluginModified(plugin.ID))
         {
-            API.ShowMsg(string.Format(API.GetTranslation("failedToInstallPluginTitle"), plugin.Name),
+            API.ShowMsgError(string.Format(API.GetTranslation("failedToInstallPluginTitle"), plugin.Name),
                     API.GetTranslation("pluginModifiedAlreadyMessage"));
             return;
         }
@@ -148,7 +148,7 @@ public static class PluginInstaller
     {
         if (API.PluginModified(oldPlugin.ID))
         {
-            API.ShowMsg(string.Format(API.GetTranslation("failedToUninstallPluginTitle"), oldPlugin.Name),
+            API.ShowMsgError(string.Format(API.GetTranslation("failedToUninstallPluginTitle"), oldPlugin.Name),
                     API.GetTranslation("pluginModifiedAlreadyMessage"));
             return;
         }
diff --git a/Flow.Launcher.Core/Plugin/PluginManager.cs b/Flow.Launcher.Core/Plugin/PluginManager.cs
index 5b74d80f0..5bff71007 100644
--- a/Flow.Launcher.Core/Plugin/PluginManager.cs
+++ b/Flow.Launcher.Core/Plugin/PluginManager.cs
@@ -566,7 +566,7 @@ namespace Flow.Launcher.Core.Plugin
         {
             if (checkModified && PluginModified(plugin.ID))
             {
-                API.ShowMsg(string.Format(API.GetTranslation("failedToInstallPluginTitle"), plugin.Name),
+                API.ShowMsgError(string.Format(API.GetTranslation("failedToInstallPluginTitle"), plugin.Name),
                     API.GetTranslation("pluginModifiedAlreadyMessage"));
                 return false;
             }
@@ -586,14 +586,14 @@ namespace Flow.Launcher.Core.Plugin
 
             if (string.IsNullOrEmpty(metadataJsonFilePath) || string.IsNullOrEmpty(pluginFolderPath))
             {
-                API.ShowMsg(string.Format(API.GetTranslation("failedToInstallPluginTitle"), plugin.Name),
+                API.ShowMsgError(string.Format(API.GetTranslation("failedToInstallPluginTitle"), plugin.Name),
                     string.Format(API.GetTranslation("fileNotFoundMessage"), pluginFolderPath));
                 return false;
             }
 
             if (SameOrLesserPluginVersionExists(metadataJsonFilePath))
             {
-                API.ShowMsg(string.Format(API.GetTranslation("failedToInstallPluginTitle"), plugin.Name),
+                API.ShowMsgError(string.Format(API.GetTranslation("failedToInstallPluginTitle"), plugin.Name),
                     API.GetTranslation("pluginExistAlreadyMessage"));
                 return false;
             }
@@ -647,7 +647,7 @@ namespace Flow.Launcher.Core.Plugin
         {
             if (checkModified && PluginModified(plugin.ID))
             {
-                API.ShowMsg(string.Format(API.GetTranslation("failedToUninstallPluginTitle"), plugin.Name),
+                API.ShowMsgError(string.Format(API.GetTranslation("failedToUninstallPluginTitle"), plugin.Name),
                     API.GetTranslation("pluginModifiedAlreadyMessage"));
                 return;
             }
@@ -712,6 +712,8 @@ namespace Flow.Launcher.Core.Plugin
             {
                 _modifiedPlugins.Add(plugin.ID);
             }
+
+            return;
         }
 
         #endregion