Molti is fully compatible with Divi v4.9+, just make sure that you’ve installed the latest version of the Divi theme. Some features may not work correctly if the Divi theme version is less than v4.9.
Fresh Installation of WordPress (Recommended)
upload_max_filesize (512M or more)
max_input_time (300 or more)
memory_limit (512M or more)
max_execution_time (1000 or more)
Contact your hosting support and ask them to increase these values if possible.