Ok, first go to your LR account >> Merchant Tools and Create new store.
Choose store name and security word, other fields are not needed.

Go to your Aurora AP - Payment Settings

and fill it like this
Account name = Store name
Security key = Security word
That's it!
Now, because of recent changes in the LR open wizards/final.php.
find this code and remove url_variables
function liberty_code($payment_id, $amount, $order_id) {
global $url_variables, $settings;
return "
<form action=\"
https://sci.libertyreserve.com\" method=\"get\">
<input type=\"hidden\" name=\"lr_acc\" value=\"".$settings['liberty_account']."\" />
<input type=\"hidden\" name=\"lr_store\" value=\"".$settings['liberty_name']."\" />
<input type=\"hidden\" name=\"lr_amnt\" value=\"$amount\" />
<input type=\"hidden\" name=\"lr_currency\" value=\"".$settings['liberty_currency']."\" />
<input type=\"hidden\" name=\"lr_success_url\" value=\"".$settings[base_url]."/index.php?view=thankyou&order_id=$order_id&
".$url_variables."\" />
<input type=\"hidden\" name=\"lr_success_url_method\" value=\"POST\" />
<input type=\"hidden\" name=\"lr_fail_url\" value=\"".$settings[base_url]."/index.php?
".$url_variables."\" />
<input type=\"hidden\" name=\"lr_fail_url_method\" value=\"LINK\" />
<input type=\"hidden\" name=\"lr_status_url\" value=\"".$settings[base_url]."/payment.php\" />
<input type=\"hidden\" name=\"lr_status_url_method\" value=\"POST\" />
<input type=\"hidden\" name=\"lr_orderid\" value=\"$order_id\" />
<input type=\"submit\" name=\"submit\" value=\"Pay Now With Liberty Reserve\">
</form>
";
}
Will there be any side effects, i don't know yet, but it is the only way to make this work.