Where can I find the documentation for InTouch OMI SDK for System Platform 2023 R2?

I can't find the documentation for InTouch OMI SDK anymore. The following link mentioned that it should be still available: Application Server and AVEVA OMI

The former path was "C:\Program Files (x86)\ArchestrA\Framework\Docs\1033\OMISDKHelp\index.html"