hi,
you may find that you need to install the RVT Steel library content as well to get the AS Extension to work.
https://knowledge.autodesk.com/support/revit/downloads/caas/downloads/content/autodesk-revit-2023-co...
also the Advance Steel extension for Revit is listed under the Autodesk account, as an extension in the new presentation of the account portal, filter to revit, then view details to see what is linked to revit.
then when the page changes go to extensions.
then scroll down in the list
HTH
John Bennett
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