What are the weight limits for using LATCH connectors with the Evenflo 4-in-1?

You cannot use LATCH connectors with the internal harness when restraining a child weighing more than 18 kg (40 lbs). Once your child exceeds this weight limit, you MUST use vehicle seat belt installation only instead of LATCH. This restriction ensures the proper functioning of the lower anchor system for child safety. (Page 16)