I have SDK 2.58.181218 installed. I am choosing the option in the editor extensions window to upgrade to 2.62.190304.
I am then told in a popup that the current SDK will be removed and the latest version will be installed. I click confirm.
I then get a popup saying that moving a file from Temp into Assets/PlayFabSdk has failed. This is because the PlayFabSdk folder does no longer exist. I cancel the popup, then several more, before it starts importing.
At the end I get a load of errors in the console and when I look at PlayFabSharedSettings in the inspector I can see my settings have been lost (Title Id and Developer Secret Key).
The SignalR .NET20 folder is now empty apart from LICENSE and README.
Also, PlayFabUnitySdk.unitypackage is in PlayFabEditorExtensions/Editor/Resources.