The latest Cemu changes primarily concern shaders, specifically gl_PointCoord access. According to the patch notes, this requires updated drivers directly from GPU vendors (AMD/NVIDIA). Standard drivers installed by Windows' default won't work, as they lack "proper point sprite support."

Cemu version 1.15.12 patch notes:

Fixed a bug where Cemu would take two screenshots when closing the gamepad UI
A notification is now displayed when taking a screenshot (if overlay notifications are enabled)
Added a game profile option to set TV or GamePad output as the default screen
The graphic interface window now allows filtering games included in the game list (enabled by default)
Fixed a bug where any modified graphic pack settings were lost when updating graphic packs
Added a fallback for downloading community graphic settings in case cemu.info is unavailable or offline
Added support for gl_PointCoord access in shaders

YouTube

By loading, you allow content from YouTube (cookies may be set).

The new version of Cemu, the Nintendo Wii U emulator version 1.15.12, is currently only available to Patreon subscribers. It will be released to the public on August 16.

You'll be able to download it from the official website of the emulator.