Get to know what has changed since the previous version:
Tekla Structures 2019i release notes
We add links to documentation of fixes and additional new features on the release notes page when the main version or service pack is released.
The local Trimble offices and resellers provide their notes on changes to the local environments in the Localization release notes.
Update the licenses, license server and Tekla Structures as explained in Upgrade Tekla Structures to a new version , or apply a service pack to a previously installed version as explained in Install a Tekla Structures service pack.