You need to open the Developer Tools console in your browser to change how the website sees your computer.
Microsoft provides direct ISO links on their download page, but they are usually hidden for desktop users and shown only to mobile devices. By temporarily making your browser look like a mobile device, you can access these official links.
The popular Rufus tool has a built-in script that allows you to download any version of Windows 10 directly within the app.
Use this ISO only in a virtual machine (VirtualBox or VMware) with "Host-Only" or "NAT" networking disabled, or on a physically air-gapped machine.