Hi Paul,
After installing the SSIS SharePoint List Adapters on SQL Server 2012 Integration Services system, I can reproduce the issue. There is no SSIS Data Flow Items pane in the Choose Toolbox Items dialog box.
Please note that from SQL Server 2012, it will automatically detect new custom components, and add them to the toolbox. If SSDT is already open when you install the adapter, right click on the Toolbox and select the Refresh option. Those two components located
under Common group in the SSIS Toolbox pone.
The following screenshot is for your reference:
Besides, if your SQL Server version is 2014, maybe we need waiting for the update. Because the current SharePoint List Adapter that extracting and loading SharePoint Data in SQL Server Integration Services supports x86/x64 systems using SQL 2005 / SQL 2008
/ SQL 2008 R2/ SQL 2012. It doesnt support SQL Server 2014.
The workaround is to use OData Source component instead. For more details, please refer to the following thread:
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/24ee715a-17c1-417f-b7af-de3b990e192d/ssis-2014-sharepoint-list-source-and-destination-missing-from-the-toolbox?forum=sqlintegrationservices
Thanks,
Katherine Xiong