DCU 5.5: Dell Command | Update | Dell US
DCU 5.5 installer: https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=P4DJW
Install .NET Desktop Runtime
.NET 8: https://dotnet.microsoft.com/en-us/download/dotnet/8.0
.NET 8 offline installer v8.0.15: https://dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-desktop-8.0.15-windows-x64-installer
References: Download .NET (Linux, macOS, and Windows)