Background: I had split up an existing .xlam add-in, and I did that similar to the way described at https://trumpexcel.com/excel-add-in/. But now, whenever I open Excel, it gives me two consecutive “Exclamation” messages:

How did you 'split' the .xlam? The link has nothing about spliting, only making, etc.

What I would do is

1. Take the XLSM that I created the XLAM from
2. Divide the code into 2 XLSM's, including any required worksheets, etc
3. Check out everything throughly
4. Save each XLSM as a XLAM
5. Install the XLAM's using Options, Addins