The Download Page provides a link to the online installer. The online installer downloads the necessary files to install the trial version. If the online installer cannot download the installation files, it provides you a link to download the offline installer.
Unified Installer for .NET Core 3.0 Desktop Development
This installer includes DevExpress WinForms (CTP) and WPF components and libraries built against .NET Core 3.0. The installer creates a local NuGet feed with DevExpress .NET Core assemblies, and adds this feed into your Visual Studio 2019 IDE.
You can install these products side by side with the .NET Framework installation.