Hello @Louseee
You have contacted 3rd party support. Please don't share any of your information with 3rd party support and also don't allow them access your computer.
To contact McAfee Support, please visit the below link,
McAfee Support
Let me know the country you are from so that I can provide you the support number as well.
Also let me know the exact problem you are facing when installing McAfee on your computer.
Regards,
Madhan M