Temporary solution for transfer purchases problem
This is temporary solution for transfer purchases problem by making iTunes as App Store till Apple solve this issue.
1. Stop automatic download of updates from your device (Setting>App and iTunes Stores>switch off Updates from Automatic downloads)
2. Open iTunes on your Mac or PC.
3. Go to apps section and click on updates on top middle screen.
4. Download all the updates available for apps.
5. Connect your Device with iTunes through USB or WiFi.
6. Go to apps section on your device screen and click the update on the apps that needs update.
7. When finish click on apply on the bottom right screen. This will sync all the updates to your device.
I know that this solution is not practical but it is the only solution now if you have slow or limited internet connection (at least you are going to download once instead of downloading 2 or 3 times if you have more than one device)