1.3.2 Opencart PayPal Express (q) Redirection to Guest_Step_

HI All,
I have open card 1.3.2 and PayPal express, however after a successful paypal transaction it attempts to redirect to guest_Step_3, after looking in this, i find that this PHP file was introducted in 1.4.0, so the question is how can i fix this for 1.3.2? I assume others have had this problem and found a fix, would be good if someone could share or provide a idea to fix it.

okay, apparently this could be due to a guest checkout, i did install a guest checkout for 1.3.2, however i am not sure i can locate the old files for it, does anyone have this... needing to replace the files modifed with unmodified versions, thus to remove the guest checkout function.

since i would rather have paypal working then the guest checkout.

can anyone help?