Windows 11.5

Windows 11.5 (Up the Valley) is a highly unstable development version of Windows, rumored to be the original beta of Windows 12, even though Windows 12 has nothing to do with this version. It was available to users of the Insider program for a short time. There are some major changes between 11.5 and 11.1, such as the removal of the Windows 10 theme and the appearance of numerous bugs. The version released was a prototype that automatically enrolled you in the Insider program if you signed in with your Microsoft account. Multiple updates were released until a "release preview" build, after which Microsoft announced that the build would end support and ask users to upgrade to Windows 12 at startup, which had already been released by that point.
Windows 12 is not based on the Windows 11.5 codebase; it is based on the 11.1 codebase.
== New Features ==
* UI is revamped (New startup animation, taskbar design, and start menu design).
* Windows 10 theme is completely removed.
* Fluent style Live Tiles with rounded corners and neomorphism shape are added to the start menu.
* A lot of kernel and internal code changes, mostly unnoticeable.
== Bugs ==
* Explorer is very slow and consumes lots of RAM; the start menu live tiles are also very hard on the GPU.
* The UI is very glitchy and can randomly crash.
* Taskbar constantly flashes when a windowed program is opened.
* Corners randomly convert back to square on some windowed programs and flash between rounded and square.
* Some applications can randomly switch to the light theme if the dark theme is enabled, although this isn't true vice versa.
* Notepad causes a BSOD every time it is opened (Fixed in Release Preview version).
* File Explorer can rarely revert back to the old style with the ribbon interface.
* Control Panel refuses to open and freezes explorer.exe.
* Many programs are very unstable and won't open.
* The computer will very rarely suddenly crash and boot into a black screen, and a glitched startup sound will play. The text "Windows protection error. You need to restart your device" may also appear on the black screen. If the PC has fans, they will also run on maximum power when this occurs, and it also seems to heat the CPU a lot. This is probably the most dangerous bug on the list and is known as the "11.5 Black Screen of Death." Two cases of it corrupting the hard drive have also been reported, although it is unknown if they are hoaxes.
Category:Fictional Windows versions