I updated my vs 2019 16.3.10 to 16.4 and .net core 3.0 to .net core 3.1 but the blazor web assembly application template is missing.
Try the following to install the latest Blazor WebAssembly template. Run the following command:
dotnet new --install Microsoft.AspNetCore.Components.WebAssembly.Templates::3.2.0-preview3.20168.3
Get the latest version here. It's free...