The easiest way to get Windows 11 is by checking Windows Update on a supported, fully up-to-date Windows 10 PC. But if you aren't seeing it there, or if you have several computers to upgrade and only ...
Problem is very low pixel/vertex shader support, so DirectX 8 and DirectX 9 games can't use shaders ... click on New CD/DVD (IDE) and point Use ISO image file to your Windows 98 installation CD ISO.
Microsoft says that the undeletable 8.63GB cache is actually freed up already; the reason it appears on the Disk Cleanup app ...