The latest iTunes is 12.5 and it requires OS X 10.9 or later. You need to upgrade your Mac OS X 10.7 to latest version. The latest is 10.12 Sierra. This is your only way to fix this problem. The problem you are having is incompatibility issue with Mac and iPad version and there is no other way to make it work.
Follow the steps below to upgrade the OS X if your Mac support it.
Click on the Apple icon and App Store. This will bring App Store. Click Updates tab. If your Mac can handle latest OS X, then you will see macOS Sierra there with FREE UPGRADE button. Click Free Upgrade and enter your Apple ID and password.
This will download the update. It may take a few hours to download. Once the download is completed, it will bring the OS X Installer. Follow the onscreen instructions to install it. It may take up to 3 hours to install the upgrade.
I know you are looking for a solution, but this is your only way to fix this problem. If you are not satisfied, please don't rate me bad or poor or OK as it will badly affect my job here. You don't have to rate anything if you are not satisfied.
If you don't want to upgrade, then you have to sync your iPad with via iCloud with your Mac. You can use Dropbox application to transfer photos etc to your Mac.