How to convert it? Convert LA add-in to 2023 (slam) — Excel Forum I have an existing LA add-in that I want to convert to 2023 slam format. I have searched for a few options, but I believe the save-as button is hidden in the Add-in dialog and is not accessible when the Add-in is active. Why? Please advice me how to do it. Convert LA Add-in to 2023 slam • Excel Tutorials What are add-ins? How to create custom functions in Excel.