Your new camera requires at least Lightroom 5.7. There are no updates for Lightroom 4. You will either have to purchase an upgrade, or download the free DNG converter and use it to create DNG copies of your images that you can open in Lightroom 4.
Your camera is too new for Lightroom 4, the latest version of Lightroom is LR CC/6, which is what will support your 7Dmkii.
Or else use DNG converter
- Adobe - Adobe Camera Raw and DNG Converter : For Windows
- Adobe - Adobe Camera Raw and DNG Converter : For Macintosh
Not a problem
Do I have to uninstall 4 before updating?
No need to uninstall, you can also purchase the upgrade key to Lightroom 5 , then update Lightroom 5 to LR 5.7.1
Appreciate the help