Update always asks for old password in iPad

[blin]

Q: I have changed my email address or Apple Store ID on my iPad. Whenever I do a update, it asks me for the old email password. I can't find a place to re-enter my new email and password.

A: Since you purchased the apps using the old email or account so that the update always asks for the old email password. In other word, if you download a new apps, I don't have this problem. The solution is use the old email password or delete the apps (if it is free) and then download it.