Keep in mind that the Magento messaging system is totally disconnected from any sort of mechanism that knows what version you have installed. It will stupidly show the message even though 1.9.2.0 does not need the SUPEE-6285 PATCH!!
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Good pointer, we've got confused people out there trying to apply the SUPEE-6285 V1 to revert and then reapply SUPEE-6285 V2 to their Magento 1.9.2.0 installations.
Examining the code in the RWD checkout.phtml file shows it's already got the XSS patch, no need to mess with 1.9.2.0!
<?php if($this->getContinueShoppingUrl()): ?>
<button type="button" title="<?php echo $this->quoteEscape($this->__('Continue Shopping')) ?>" class="button2 btn-continue" onclick="setLocation('<?php echo Mage::helper('core')->quoteEscape($this->getContinueShoppingUrl()) ?>')"><span><span><?php echo $this->__('Continue Shopping') ?></span></span></button>
<?php endif; ?>
For everyone out there, 1.9.2.0 is fine, the patch is for 1.9.x.x previous to this. If you applied the V1 patch, it's missing an update to the template file
app/design/frontend/rwd/default/template/checkout/cart.phtml
And you're better off just manually editing the file to change the line out and making a note in applied.patches.list
Remove <button type="button" title="<?php echo $this->__('Continue Shopping') ?>" class="button2 btn-continue" onclick="setLocation('<?php echo $this->getContinueShoppingUrl() ?>')"><span><span><?php echo $this->__('Continue Shopping') ?></span></span></button>
Replace <button type="button" title="<?php echo $this->quoteEscape($this->__('Continue Shopping')) ?>" class="button2 btn-continue" onclick="setLocation('<?php echo Mage::helper('core')->quoteEscape($this->getContinueShoppingUrl()) ?>')"><span><span><?php echo $this->__('Continue Shopping') ?></span></span></button>
