how can I update apps using itunes on windows
how can I update apps using itunes on windows
If you installed iTunes 12.7.X, you can no longer update apps using iTunes. Now, you do it the new "old fashioned" way - directly on your device.
Changes in the new iTunes - Apple Support
How to move apps and create folders on your iPhone, iPad, or iPod touch - Apple Support
If you really want to keep that feature in iTunes you can download iTunes 12.6.3. However, that is a dead-end upgrade and will no longer be supported by Apple.