Feewubaid17 Hi.
You can buy Supersaver Tickets without any travelcard, but be sure to select the full price. By default the half fare prices are displayed. Select “No Discount” when defining the passengers.
A Supersaver Class Upgrade is only to pay the difference between 2nd and 1st class. You must have a valid 2nd class ticket to use it. Please note that the combination Supersaver 2nd class ticket with Supersaver Upgrade is not allowed.
If you want to travel in 1st class, buy a Supersaver Ticket 1st class.