A: It is a lifetime access, but to activate it you need to follow the process sent to you after the coupon's purchase. The process is simple, you need to click on "account and subscription" at the bottom left of your dashboard, then put your coupon in a text input labeled "AppSumo coupon".

Regular users only have access to recurrent subscription, this is why you need this small trick to activate your account.

I have sent you some screenshots by email to show you where this input is.