There is no "content pack" for upgrading to 9.32. Content packs provide optional functionality (e.g. deploying process designer), but are not mandatory parts of the upgrade process. 9.32 includes some items which were previously delivered via content packs (HTML mail, UCMDB integration updates, etc.), but they are included as part of the application upgrade itself.
Links to all 9.3x releases are included in the linked Overview of Releases document.