DLLs are available from repositories like DLLme or SourceForge . Key Features
Optimized for both small files and very large files. FastColoredTextBox.dll
To help you get started with the right version, are you using: (WinForms) NET 6/7+ ? DLLs are available from repositories like DLLme or
It is designed for Windows Forms. To use in WPF, you must use WindowsFormsHost . FastColoredTextBox.dll
Knowing this will help me guide you to the right integration method. Display a component downloaded from NuGet - Stack Overflow