old post but the only way to select a different time option after having purchased is to renew under the initial term you last bought that product for then cancel renewals right away. Example, I purchase 7DTD 1x day, the one day then expires, now I am only left with the option to renew under one day so then I would need to renew 1 day then cancel renewals under manage purchases and that product. absolutely broken and should be addressed by the owner to avoid loss of future renewals. I hope this is helpful to some degree if anyone can make sense of how busted purchases are at the moment.
