Requirement:
-Windows Vista SP2 up to Windows 10 2009 (19042.xxx October 2020) (anything higher is at your own risk)
-NVIDIA, AMD, Intel GPUs
-Microsoft .NET Framework 4.5 or higher

Recommended usage:
-You MUST disconnect your internet or completely block Windows Update when running DDU until you have re-installed your new drivers.
-DDU should be used when having a problem uninstalling / installing a driver or when switching GPU brand.
-DDU should not be used every time you install a new driver unless you know what you are doing.
-The tool can be used in Normal mode but for absolute stability when using DDU, Safemode is always the best.
-If you are using DDU in normal mode, Clean, reboot, clean again, reboot.
-Make a backup or a system restore (but it should normally be pretty safe).
-It is best to exclude the DDU folder completely from any security software to avoid issues.
-If you encounter issues, read the "Issues and solutions.txt"

For a guide , check : https://www.wagnardsoft.com/content/ddu-guide-tutorial