Add UseDesignApplicationLoader

Directory.Build.props

@@ -1,5 +1,5 @@
 <Project>
 	<PropertyGroup>
-		<Version>1.0.0-beta</Version>
+		<Version>1.0.0-beta.1</Version>
 	</PropertyGroup>
 </Project>

README.md

@@ -71,6 +71,16 @@ public class App : DesignApplication
 }
 ```
 
+#### UseDesignApplicationLoader
+
+The `UseDesignApplicationLoader` is `true` by default to force the Design Automation to support `PackageContents.xml` with multiple versions.
+```C#
+public class App : DesignApplication
+{
+    public override bool UseDesignApplicationLoader => false; // true by default
+}
+```
+
 ## License
 
 This project is [licensed](LICENSE) under the [MIT License](https://en.wikipedia.org/wiki/MIT_License).

ricaun.Revit.DA/DesignApplication.cs

@@ -10,9 +10,13 @@ namespace ricaun.Revit.DA
     public abstract class DesignApplication : IExternalDBApplication, IDesignAutomation
     {
         /// <summary>
-        /// Use ExternalService to execute the IDesignAutomation.Execute, this make the Execute run in the AddIn context.
+        /// Use ExternalService to execute the IDesignAutomation.Execute, this make the Execute run in the AddIn Context.
         /// </summary>
         public virtual bool UseExternalService => true;
+        /// <summary>
+        /// Use DesignApplicationLoader to load the correct version of the DesignApplication based in the `PackageContents.xml` configuration.
+        /// </summary>
+        public virtual bool UseDesignApplicationLoader => true;
         public ControlledApplication ControlledApplication { get; private set; }
         public abstract void OnStartup();
         public abstract void OnShutdown();
@@ -24,7 +28,10 @@ public ExternalDBApplicationResult OnStartup(ControlledApplication application)
         {
             ControlledApplication = application;
 
-            designApplication = DesignApplicationLoader.LoadVersion(this);
+            designApplication = this;
+
+            if (UseDesignApplicationLoader)
+                designApplication = DesignApplicationLoader.LoadVersion(this);
 
             if (designApplication is IExternalDBApplication)
             {