If you are upgrading from SDL Knowledge Center 13 and you have been using the new Content Delivery framework, or if your are upgrading SDL Tridion Docs 14, you must now update your Content Delivery instance.
Upgrading Content Delivery microservices The Content Delivery microservices, also called Content Interaction Services, are the server-side components of Content Delivery. You can upgrade the microservices on a target machine or inside a Docker container. If you are performing a rolling upgrade of your (staging or live) delivery and presentation environment, refer to the section about staged and rolling upgrades to learn the order in which to upgrade the various Content Delivery software components.
Upgrading client-side Content Delivery software components With the exception of the IQ website extension (also called the IQ Query Client CIL), which is discontinued as from Tridion Docs 15, upgrade the client-side Content Delivery software components to a version compatible with this product release. Caution: Always back up your client-side software components before starting your upgrade.