I think my Adobe Captivate Project is corrupt

I belive that my adobe captivate project has become corrupt 

I am using Captivate Classic on Windows 10. I have

• Cleared the Cache
• Unticked Show Playback Control
• Tried to upload to Adobe cloud LMS - upload failed
• Performed Utils Cleanpreferenceswin
• Put one of the slides from the project I am having issues with into a new project with same dimentions and it still will not preview or open published index html file
  • I have the circle of death - will not load

Please respond in very simplistic ways as I am not an IT expert

Thank you in advance