In the next subpart ("b) we install .NET 4.8 which is required for Exchange 2019 and after the installation we reboot the server for the changes to take effect.
Video Steps
1. Launch .NET 4.8
Navigate to your downloads folder where you downloaded .NET 4.8.
2. Navigate Wizard
Launch .NET 4.8 and follow the wizard by accepting the license terms and then finishing the setup. Once done, reboot your server.