MsiProvideAssembly

[DllImport("msi.dll", CharSet = CharSet.Auto)]
public static extern int MsiProvideAssembly(
   [MarshalAs(UnmanagedType.LPTStr)] string szAssemblyName,
   [MarshalAs(UnmanagedType.LPTStr)] string szAppContext,
   uint dwInstallMode,
   IntPtr hInstall,
   uint dwAssemblies,
   IntPtr lpAssemblyInformation
);

Microsoft documentation: Link