I am using Unity 2018.3.0f2. I have installed everything described here but still Package Manager is missing for my old project. I tried deleting the whole line `"com.unity.package-manager-ui": "2.0.3",` but still PM is missing. When I create new fresh project PM is visible there, but this is not important for me. I need to make my old project running fine again. Can someone assist please ? I have my editors log attached.