The upgrade instructions are available at Oro documentation website.
The current file describes significant changes in the code that may affect the upgrade of your customizations.
- Deprecated
Oro\Bundle\AlternativeCheckoutBundle\EventListener\QuantityToOrderConditionListener. Will be moved to the validation.yml config instead.
OroAlternativeCheckoutBundle has been moved from the oro/commerce package to the oro/commerce-demo-checkouts package.