Official support for Windows 7 ended in January 2020. ISOs labeled "2021 Update" (or later) are rather than official Microsoft products. They typically include:
Using pre-activated software is a significant security risk. Because the system files have been modified, these ISOs can contain embedded malware, keyloggers, or backdoors that are difficult to detect. Reliable Sources and Custom Creation windows-7-ultimate-sp1-update-2021-preactivated-iso-gratis
Many include .NET Framework 4.8, DirectX, and Internet Explorer 11 pre-installed. Understanding "Pre-Activated" ISOs Official support for Windows 7 ended in January 2020
The essential foundation for any modern Windows 7 installation. these ISOs can contain embedded malware
If you must use Windows 7, it is safer to download an "untouched" official ISO and update it yourself: How to get updated windows 7 sp1 iso?