Merge pull request #80 from Mbucari/master

Fixed AAXC not downloading.

FileLiberator/DownloadDecryptBook.cs

@@ -78,7 +78,7 @@ namespace FileLiberator
                     contentLic?.ContentMetadata?.ContentUrl?.OfflineUrl,
                     contentLic?.Voucher?.Key,
                     contentLic?.Voucher?.Iv,
-                    Resources.UserAgent
+                    "Audible/671 CFNetwork/1240.0.4 Darwin/20.6.0"
                     );
 
                 if (Configuration.Instance.AllowLibationFixup)

FileManager/BackgroundFileSystem.cs

@@ -22,6 +22,8 @@ namespace FileManager
 
         public string FindFile(string regexPattern, RegexOptions options)
         {
+            if (fsCache is null) return null;
+
             lock (fsCache)
             {
                 return fsCache.FirstOrDefault(s => Regex.IsMatch(s, regexPattern, options));

LibationLauncher/LibationLauncher.csproj

@@ -13,7 +13,7 @@
     <!-- <PublishSingleFile>true</PublishSingleFile> -->
     <RuntimeIdentifier>win-x64</RuntimeIdentifier>
 
-    <Version>5.4.8.3</Version>
+    <Version>5.4.9.0</Version>
   </PropertyGroup>
 
   <ItemGroup>