1. cai dat dotnet sdk 3.1 tai link sau:
https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/sdk-3.1.426-windows-x64-installer
neu may cua ban la Windows x86 thi cai dat tai link sau:
https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/sdk-3.1.426-windows-x86-installer
2. cai dat signer plugin