After you download Nkit 1.4, check the file hash (if available from the source) or simply scan it with Windows Defender / Malwarebytes. A clean download will not trigger any "PUP" (Potentially Unwanted Program) warnings unless flagged as a hacktool – which is common but safe if from a trusted source.
Includes update partitions for all US games in the "Wii Vault". Download Nkit 1.4 Wii Partitions