If I understand correctly, only the latest version of the ST_GEOMETRY .dll is available in My Esri downloads.
For example, the version of ST_GEOMETRY for Oracle isn't compatible with older versions of Oracle such as 18c:
The database version is not supported. Error: Oracle version 18.0.0.0.0 not supported.
See the setup log in the following location for additional error information:
Could not setup Esri spatial type.
Failed to execute (CreateSpatialType).
Could older versions of ST_GEOMETRY be made available in My Esri?
Thanks.