Earlier i was facing the similar issue. But later i find the solution by own. If you are trying to update or download any app and selected the setting auto update over WiFi than you need to go to my app and update buttons where you will see many app standing in a line for update  . You need to cancel the downloading by clicking on cross sign after that you will see a update button next to the app. Now your app is ready for update without any WiFi. Thanks Vaibhav

If you are trying to update or download any app and selected the setting auto-update over WiFi, then you need to go to the My apps and Update buttons where you will see many apps are queued for the update. You need to cancel the downloading by clicking on the cross sign, after that you will see an update button next to the app. Now, your app is ready for update without any WiFi.