in customer/cart.php
change:
Code:
if (($cart["products"][$k]["amount"] >=1) && ($distribution))
{$cart["products"][$k]["amount"]=1; $amount=0;}
$cart["products"][$k]["amount"] += $amount;
to:
Code:
if (($cart["products"][$k]["amount"] >=1) && ($distribution))
{$cart["products"][$k]["amount"]=1; $amount=0;}
if ($cart["products"][$k]["amount"] >=2)
{$cart["products"][$k]["amount"] = 2; $amount=0;}
$cart["products"][$k]["amount"] += $amount;
Please note this code is for 3.4.2