I have the same problem.
Also had error 1923 tha could be ignored.
Can some one from AutoDesk help us here?
Welcome to the Autodesk Community, Alexandre!
I was able to locate these threads that may assist you with troubleshooting your error 1920:
If you have any other questions or concerns please respond to this post.
Start with some of our most frequented solutions or visit the Installation and Licensing Forum to get help installing your software.