Magento – Add to Cart from Wishlist not working

You have 2 options here.
Option 1.
Edit all cart and cart item templates and remove the wishlist column.
For this you need to edit:

• checkout/cart.phtml
• checkout/cart/item/default.phtml
• downloadable/checkout/cart/item/default.phtml

Option 2
Override the Mage_Wishlist_Helper_Data::isAllowInCart method and make it return false always.
For this second option you need a new module. Let's call it Easylife_Wishlist. Create these files:

app/etc/modules/Easylife_Wishlist.xml - the declaration file:

<?xml version="1.0"?>
<config>
    <modules>
        <Easylife_Wishlist>
            <codePool>local</codePool>
            <active>true</active>
            <depends>
                <Mage_Wishlist />
            </depends>
        </Easylife_Wishlist>
    </modules>
</config>

app/code/local/Easylife/Wishlist/etc/config.xml - the configuration file

<?xml version="1.0"?>
<config>
    <modules>
        <Easylife_Wishlist>
            <version>1.0.0</version>
        </Easylife_Wishlist>
    </modules>
    <global>
        <helpers>
            <wishlist>
                <rewrite>
                    <data>Easylife_Wishlist_Helper_Data</data> <!-- tell magento to use your own helper instead of the default one -->
                </rewrite>
            </wishlist>
        </helpers>
    </global>
</config>

app/code/local/Easylife/Wishlist/Helper/Data.php - your new helper

<?php 
class Easylife_Wishlist_Helper_Data extends Mage_Wishlist_Helper_Data 
{
    public function isAllowInCart()
    {
        return false;
    }
}

Clear the cache, disable compilation if enabled and you are done.

If you want to hide Add-to-Cart button for not logged-in customers, then following link might help you:

• https://stackoverflow.com/questions/23731127/how-to-show-add-to-cart-after-login-only-in-every-page-with-magento