Google Play Games Services - The name 'PluginVersion' does not exist in the current context

After creating my Unity project, I first import the Google Play Game Services plugin into the project. When I open GPGS code with VS Code, I see an error for PluginVersions. Below is the picture of the error (pic1). Although I have PluginVersions.cs (pic2) file, it can’t find the code. I tried it in versions 2019.4.13f1 and 2020.1.11f1 but couldn’t fix the error in any of them. Thnx


Fixed for me
downloading this repo

drag drop
in to unity

after that
navigate to the downloaded repo
and copy all of the folders and scripts into the game folder