I installed on March your thema version 2.0.1.
Now I realized that there were updates and I downloaded the latest version 2.1.0.
The correct procedure for upgrading your theme to the latest version is: overwrite all files in the “mercantile” folder with those extracted from the “mercantile.2.1.0.zip” file?
I use child theme where I customized the theme.
I did not find any info in the documentation.
Thanks again for making your theme available free