The E-series of adventures can be played in any order. You do NOT have to play then in the E-1, E-2 and E-3 order.
How do you want your refund to be processed?
Refund to Card: this refunds your money back to your credit/debit card minus the non-refundable payment processing fee.
Credit to Account: this adds a credit for the entire purchase price to your td.events account that can be used to purchase other tickets and tokens. Credits cannot later be refunded back to your credit/debit card.