If you are using Microsoft Windows 10, be very cognizant of pop-ups and links that lure you to download the Windows 11 upgrade installer. There are hundreds of fake installer packages out there that can infect your system with malware.
Right now, Windows 11 is available only to Microsoft customers who are part of its Insider program; if you are not enrolled as an Insider, you cannot upgrade to Windows 11 until 2022.
Here is an example from Kaspersky security experts showing a downloader designed to deliver malware:
Always remember to download Windows updates and upgrades from official Microsoft websites only. Keep in mind that fake installers can look a lot like the real thing.
For the full story, see https://www.bleepingcomputer.com/news/security/fake-windows-11-installers-now-used-to-infect-you-with-malware/.