Order Form for WooCommerce v2.3.0 has been released. It supports WooCommerce High Performance Order Storage (HPOS); is tested up to WooCommerce 8.2.
WooCommerce added optional support for High Performance Order Storage (HPOS) in version 7.1, and whilst this plugin has long been compatible with that, it hasn’t declared compatibility. This version now announces that it is compatible, so WooCommerce won’t show it as not compatible.
You can update to the latest version from your WordPress plugin admin page. Here’s the full changelog for Order Form for WooCommerce.