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Hi nkehli​,

Thank you for reaching out!

To answer your question directly: No, there is no equivalent documentation for upgrading from Platform 8.x to 9.1.

The reason is that the architectural changes introduced in earlier versions (pre-v8 to v8) required more extensive guidance and planning. In contrast, the transition from v8 to v9 is more straightforward and does not necessitate the same level of prework. As a result, a dedicated upgrade guide—like the one provided for v8+, was not created for this version jump.

For general upgrade information, I’d recommend starting with these resources:

• the Upgrade Guide included with each release on the OneStream Documentation website, and
• the 9.1.0 Platform Release Highlights on Navigator

If you have specific questions, I’m happy to provide further details or you can always contact OneStream Support by registering at Support - OneStream Software.