Enable Apply automatically when the coupon should be added as soon as its rules are satisfied. The plugin silently removes it when the rules are no longer satisfied. WooCommerce's Individual use only setting controls whether the automatic coupon can be combined with other coupons.
The optional Applied message appears above the classic cart. Automatically managed coupons do not show a remove link because their presence is controlled by their rules.
By default, the configured percentage applies only to qualifying products. Enable Apply to Cart Subtotal to calculate it from the full current cart subtotal instead. WooCommerce allocates that total across cart lines for tax accounting. Sale-priced items are included at their current cart prices.
The rule-based discount type always allows sale-priced items, so WooCommerce's Exclude sale items setting is disabled for these coupons.
Rule-based coupons follow WooCommerce's Individual use only setting. When enabled, applying the coupon replaces incompatible coupons and an incompatible incoming coupon can replace it. When disabled, compatible coupons can remain applied together.
Migration is manual. Record the old coupon settings, deactivate DK WC Quantity Discount Coupons, activate this plugin, and recreate the coupon with the new rule fields. Do not run both plugins at the same time.