Cannot Order 10 days Premium Time
The starter kit with 10 days Premium Time is a one-time offer that is only available for accounts that never had Premium Time before.
It is possible that you never had Premium Time, but the starter kit is still not shown to you. This happens if you previously tried to order the starter kit but for some reason, the order was not successful.
In this case, you need to cancel the unsuccessful order. To cancel it, click on the "Withdraw" button in your Payments History on your Tibia account management page. Once you have done this, the option to order 10 days of Premium Time will be available again.