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Thank you.

For 1.7.6.4 the needed modification is in

src/Adapter/Presenter/Cart/Cartpresenter.php

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'minimalPurchaseRequired' => ($productsTotalExcludingTax < $minimalPurchase) ?

Replace with

'minimalPurchaseRequired' => ($totalCartAmount < $minimalPurchase) ?

Don't forget to edit the language file for taxes text.