update per comment

Author: jjw24

Flow.Launcher.Infrastructure/UserSettings/DataLocation.cs

@@ -30,7 +30,6 @@ public static bool PortableDataLocationInUse()
         }
 
         public static readonly string PluginsDirectory = Path.Combine(DataDirectory(), Constant.Plugins);
-        public static readonly string SettingsDirectory = Path.Combine(DataDirectory(), "Settings");
-        public static readonly string PluginSettingsDirectory = Path.Combine(SettingsDirectory, Constant.Plugins);
+        public static readonly string PluginSettingsDirectory = Path.Combine(DataDirectory(), "Settings", Constant.Plugins);
     }
 }

Plugins/Flow.Launcher.Plugin.WebSearch/Main.cs

@@ -174,11 +174,14 @@ public void Init(PluginInitContext context)
             _context = context;
             var pluginDirectory = _context.CurrentPluginMetadata.PluginDirectory;
             var bundledImagesDirectory = Path.Combine(pluginDirectory, Images);
+            
+            // Default images directory is in the WebSearch's application folder  
             DefaultImagesDirectory = Path.Combine(_context.CurrentPluginMetadata.PluginDirectory, Images);
             Helper.ValidateDataDirectory(bundledImagesDirectory, DefaultImagesDirectory);
 
+            // Custom images directory is in the WebSearch's data location folder 
             var name = Path.GetFileNameWithoutExtension(_context.CurrentPluginMetadata.ExecuteFileName);
-            CustomImagesDirectory = Path.Combine(DataLocation.PluginSettingsDirectory, $"{name}\\CustomIcons");
+            CustomImagesDirectory = Path.Combine(DataLocation.PluginSettingsDirectory, name, "CustomIcons");
         }
 
         #region ISettingProvider Members