Updated Readme.md

ReadMe.md

@@ -20,10 +20,15 @@ If you have any suggestion/bug or you want to contribute, don't hesitate to add
 Get the [latest release](https://github.com/BenPyton/ProceduralDungeon/releases) compatible with your Unreal version.
 
 **For blueprint only projects**\
-You have to extract the plugin inside your Ureal engine `Plugins` folder.\
+__Before plugin version 1.2.1__:\
+Upgrade your project to a C++ project and follow the instruction for C++ project below, or you wont be able to package your game.\
+(To do that, download Visual Studio 2019 and create a new C++ class from the Unreal Editor)
+
+Since plugin version 1.2.1:\
+You have to extract the plugin inside your Unreal engine `Plugins` folder.\
 For instance: `C:\Program Files\Epic Games\UE_4.26\Engine\Plugins`
 
 **For C++ projects**\
-You can install the plugin in the engine like for blueprint projects.\
+Since the plugin version 1.2.1, you can install the plugin in the engine like for blueprint projects.\
 You can also extract the plugin in the `Plugins` folder of your project.\
 For instance: `D:\PathToYourProject\Plugins`