Android Studio “Update and Restart” button is disable

My Android Studio is version：4.2 Beta 5 , and I want to update it to stable version- 4.2.2.
When I check the version ,an updating window pop out, but the "Update and Restart" button is disable to click. What can i do to complete the updating work?

Thanks everyone’s answer for me. Someone says I need to uninstall the beta version , but the window show the patch size for updating beta version to stable version, There must be some way to do so without uninstall step .