The built-in Internet Explorer is completely obsolete and insecure. Avoid native Chromium browsers that dropped Windows 8.1 support; look into extended-support browsers like Firefox ESR or community forks designed to keep older operating systems browsing safely. If you need help building this image, let me know:

Historically, the Media Creation Tool was used to generate these ISOs, but its availability and functionality for 8.1 are now severely limited [5.1, 5.10]. Community-Archived "Fully Updated" ISOs

Select to perform a clean install.

Run Windows Update once manually. It may pull a few minor Microsoft .NET Framework patches or Windows Defender definition updates that were not included in the main rollups.

They frequently bundle malware, rootkits, or hidden cryptocurrency miners. They may also disable core security frameworks or telemetry protocols in a way that breaks system stability.

: Many "lite" pre-built ISOs disable core Windows Defender elements, User Account Control (UAC), and firewall protocols to simulate performance boosts, leaving you exposed to modern web exploits.