Generally, . Once you save a model in Tekla Structures 2023, it cannot be opened in 2022 or earlier. Trimble enforces forward-compatibility only. Always make a backup copy of critical models before upgrading.
It is important to distinguish this from the beta release. The first public beta for Tekla Structures 2023 arrived in early February 2023, allowing early adopters and Tekla Campus users to test new features. tekla structures 2023 release date