diff --git a/Manager.App/Models/Settings/DownloadSettings.cs b/Manager.App/Models/Settings/DownloadSettings.cs
index 86b4409..8484d7a 100644
--- a/Manager.App/Models/Settings/DownloadSettings.cs
+++ b/Manager.App/Models/Settings/DownloadSettings.cs
@@ -5,6 +5,6 @@ namespace Manager.App.Models.Settings;
 public class DownloadSettings
 {
     [ConfigurationKeyName("MaxConcurrentDownloads")]
-    [Range(-1, 20)]
-    public int MaxConcurrentDownloads { get; set; }
+    [Range(-1, 20, ErrorMessage = "Max concurrent downloads must be between 0 and 20. (0 for unlimited concurrent downloads)")]
+    public int MaxConcurrentDownloads { get; set; } = 5;
 }
\ No newline at end of file
diff --git a/Manager.App/Models/Settings/LibrarySettings.cs b/Manager.App/Models/Settings/LibrarySettings.cs
index 813cd58..059719e 100644
--- a/Manager.App/Models/Settings/LibrarySettings.cs
+++ b/Manager.App/Models/Settings/LibrarySettings.cs
@@ -5,6 +5,10 @@ namespace Manager.App.Models.Settings;
 public class LibrarySettings
 {
     [ConfigurationKeyName("Path")]
-    [Required]
+    [Required(AllowEmptyStrings = false, ErrorMessage = "Library path is required!")]
     public required string Path { get; set; }
+
+    [ConfigurationKeyName("DefaultUserAgent")]
+    [Required(AllowEmptyStrings = false, ErrorMessage = "An default user agent is required.")]
+    public required string DefaultUserAgent { get; set; }
 }
\ No newline at end of file
diff --git a/Manager.App/appsettings.Development.json b/Manager.App/appsettings.Development.json
index 771cac8..abae8bb 100644
--- a/Manager.App/appsettings.Development.json
+++ b/Manager.App/appsettings.Development.json
@@ -18,7 +18,8 @@
     }
   },
   "Library": {
-    "Path": "{workdir}/"
+    "Path": "{workdir}/Library",
+    "DefaultUserAgent": "Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0"
   },
   "Downloads": {
     "MaxConcurrentDownloads": 5
diff --git a/Manager.App/appsettings.json b/Manager.App/appsettings.json
index f0fea47..a15ebba 100644
--- a/Manager.App/appsettings.json
+++ b/Manager.App/appsettings.json
@@ -19,7 +19,8 @@
   },
   "AllowedHosts": "*",
   "Library": {
-    "Path": "{workdir}/Library"
+    "Path": "{workdir}/Library",
+    "DefaultUserAgent": "Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0"
   },
   "Downloads": {
     "MaxConcurrentDownloads": 5