I've spent forever searching for a solution to this, I only found one other person with the same problem (here: https://www.mrexcel.com/forum/excel-questions/983275-xlam-not-available-excel-2016-a.html) but a solution was never reached. Any idea what would cause the option to save as an add-in to disappear? I have add ins on another computer with Excel 2016 that work fine, I want to use them on this computer so I sent the macros saved as XLSM files to myself over email, downloaded them on this computer and then couldn't find the option from the "save as" dropdown to save them as XLAM files.