Any "patched" ISO you find claiming to include "latest security updates" is lying. There are no latest updates. The OS is a static, vulnerable artifact.
: This is a widely used source for original and updated Windows 8.1 images. Look for "Windows 8.1 x64 Fully Updated" which includes patches through 2023. MSDN/Visual Studio Subscriptions
Any "patched" ISO you find claiming to include "latest security updates" is lying. There are no latest updates. The OS is a static, vulnerable artifact.
: This is a widely used source for original and updated Windows 8.1 images. Look for "Windows 8.1 x64 Fully Updated" which includes patches through 2023. MSDN/Visual Studio Subscriptions download iso windows 81 64 bit patched