title: How to open a Xcode 11 Beta 4 project in Xcode 10?
body: <p>I worked on a project in Xcode 11 Beta 4 and then downgraded to Xcode 10 and can't open the project.</p>
  
  <p>I want to submit my app to the app store, but I kept getting error messages in Xcode 11 beta 4. I'm a beginner and I know I tampered with the build settings trying to make it work. I deleted Xcode 11 and downloaded Xcode 10 to try and archive through that, but now I can't even open the project with Xcode 10. </p>
  
  <p>I started the project on Xcode 9, I believe. I tried archiving, but there was an <code>"SDK Version Issue"</code>, something with the old iOS. So I updated my Mac's operating system, and replaced Xcode 9 with Xcode 11 beta. That came with many more errors trying to archive, and I changed architectures and proxies and all that. So I deleted Xcode 11 and tried Xcode 10 but I can't open the project. </p>
  
  <p>It says: </p>
  
  <blockquote>
    <p>"cannot be opened because it is in a future Xcode project file format. Adjust the project format using a compatible version of Xcode to allow it to be opened by this version of Xcode." </p>
  </blockquote>
  
  <p>How do I solve the problem?</p>