Adobe officially only supports the and one previous major version of its software (e.g., versions from 2024 and 2025). Because Adobe Design 2023 (InDesign v18) is an older release, it is no longer publicly available for direct download through standard Adobe Creative Cloud channels. Official Options for Accessing Version 18

: If you only need to access an older version of a file , you can use Adobe's Version History feature if your documents are saved to the cloud. Why Avoid Third-Party Downloads? Download & Install Help - Adobe Help Center

: Users with a valid subscription can sometimes request an offline installer for older versions by Contacting Adobe Support directly.