diff --git a/Flow.Launcher.Core/Updater.cs b/Flow.Launcher.Core/Updater.cs
index 05397e906..1e4b0453c 100644
--- a/Flow.Launcher.Core/Updater.cs
+++ b/Flow.Launcher.Core/Updater.cs
@@ -8,7 +8,6 @@ using System.Threading.Tasks;
 using System.Windows;
 using JetBrains.Annotations;
 using Squirrel;
-using Newtonsoft.Json;
 using Flow.Launcher.Core.Resource;
 using Flow.Launcher.Plugin.SharedCommands;
 using Flow.Launcher.Infrastructure;
@@ -17,6 +16,7 @@ using Flow.Launcher.Infrastructure.Logger;
 using System.IO;
 using Flow.Launcher.Infrastructure.UserSettings;
 using Flow.Launcher.Plugin;
+using System.Text.Json.Serialization;
 
 namespace Flow.Launcher.Core
 {
@@ -117,13 +117,13 @@ namespace Flow.Launcher.Core
         [UsedImplicitly]
         private class GithubRelease
         {
-            [JsonProperty("prerelease")]
+            [JsonPropertyName("prerelease")]
             public bool Prerelease { get; [UsedImplicitly] set; }
 
-            [JsonProperty("published_at")]
+            [JsonPropertyName("published_at")]
             public DateTime PublishedAt { get; [UsedImplicitly] set; }
 
-            [JsonProperty("html_url")]
+            [JsonPropertyName("html_url")]
             public string HtmlUrl { get; [UsedImplicitly] set; }
         }
 
diff --git a/Plugins/Flow.Launcher.Plugin.PluginsManager/Main.cs b/Plugins/Flow.Launcher.Plugin.PluginsManager/Main.cs
index 716a424ff..d700b9dfd 100644
--- a/Plugins/Flow.Launcher.Plugin.PluginsManager/Main.cs
+++ b/Plugins/Flow.Launcher.Plugin.PluginsManager/Main.cs
@@ -22,7 +22,7 @@ namespace Flow.Launcher.Plugin.PluginsManager
 
         internal PluginsManager pluginManager;
 
-        private DateTime lastUpdateTime;
+        private DateTime lastUpdateTime = DateTime.MinValue;
 
         public Control CreateSettingPanel()
         {
diff --git a/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs b/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
index 9635648d4..428610f43 100644
--- a/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
+++ b/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
@@ -87,7 +87,7 @@ namespace Flow.Launcher.Plugin.PluginsManager
                 };
         }
 
-        internal void InstallOrUpdate(UserPlugin plugin)
+        internal async Task InstallOrUpdate(UserPlugin plugin)
         {
             if (PluginExists(plugin.ID))
             {
@@ -127,7 +127,7 @@ namespace Flow.Launcher.Plugin.PluginsManager
                 Context.API.ShowMsg(Context.API.GetTranslation("plugin_pluginsmanager_downloading_plugin"),
                     Context.API.GetTranslation("plugin_pluginsmanager_please_wait"));
 
-                Http.Download(plugin.UrlDownload, filePath);
+                await Http.Download(plugin.UrlDownload, filePath).ConfigureAwait(false);
 
                 Context.API.ShowMsg(Context.API.GetTranslation("plugin_pluginsmanager_downloading_plugin"),
                     Context.API.GetTranslation("plugin_pluginsmanager_download_success"));
@@ -264,8 +264,7 @@ namespace Flow.Launcher.Plugin.PluginsManager
                             Action = e =>
                             {
                                 Application.Current.MainWindow.Hide();
-                                InstallOrUpdate(x);
-
+                                _ = InstallOrUpdate(x); // No need to wait
                                 return ShouldHideWindow;
                             },
                             ContextData = x