Quad9 is a service being promoted by the UK Action Fraud and Police it is a legitimate piece of software and is not difficult to install – follow the instructions.
Do not be put off by terminology.
The link below takes you to the Quad9 website – It WILL NOT make any installation or changes to your computer unless the set it up yourself from the instructions.
Have a look – it is free and supported by The City of London Police.
https://www.quad9.net/#/#setup-quad9
