The theme has been updated to v1.71. The Download Page is updated with links. The WordPress Theme directory version has been updated as well.
About this Update:
- Updated to the latest pull of Bootstrap. It is currently at version 4.1.1
- Fixed sprint_f vs sprintf in utilities.php devdmbootstrap4_header_background() method. The issue being that sprint_f is nothing and it was breaking the theme when using a header background. This was pretty silly and I have no idea how it slipped through everything. Sorry if it caused anyone some trouble.