Thank you for reaching out, please know that Twinmotion project files will not be backwards-compatible and must be used with the version they were created in, or be converted to a newer version.
If you are looking to import from Twinmotion to Unreal Engine, for Twinmotion 2023.1 Preview 1 you will need to use our updated plugin available at the following page. Additional details regarding it's installation and use will be available on this page as well: Datasmith Twinmotion Content for Unreal Engine (Beta)
If you are experiencing crashing while rendering in Twinmotion, please be sure that your graphics card's drivers are up to date and that your machine meets or exceeds the recommended specifications listed here: Twinmotion System Requirements