I updated the theme Jevelin to version 5.14 and then when customers check out the Wocommerce checkout/order-received/ page gives a 404 error. The Woocommerce link is correct and I have deduced that this is a theme error because when I activate a new theme the order goes through and a 404 error does not occur.
In the mean time while this error is being fixed can you please send me the Jevelin version 5.13 when this problem did not occur.