Nothing to install: open https://kalretro.au/yunhe/play/ in a recent Chrome, Edge, Firefox or Safari. Sound starts after your first click or key press (browsers allow sound only then). Saves are kept in the browser: see Saves.
Download from https://kalretro.au/yunhe/, the Heisenbergs Files area on the BBS, or the yunhe folder on the anonymous FTP at home. SHA256SUMS beside the files has their checksums.
Banners-of-Yunhe-1.1.0-windows-x64-setup.exe and run it. Accept the licence and choose a folder, or keep the one it suggests. It installs for your own user, so no administrator is needed, and adds a Start menu entry and a desktop shortcut.The Windows installer is built on Linux; it has not yet been tried on a real Windows PC. Please report any problems.
On Debian, Ubuntu, Kubuntu, Mint and other Debian-based systems (64-bit):
sudo apt install ./banners-of-yunhe_1.1.0_amd64.deb
Then start Banners of Yunhe from the applications menu, or run banners-of-yunhe.
On other Linux systems, use the AppImage: no installing, just make it executable and run it.
chmod +x Banners-of-Yunhe-1.1.0-linux-x86_64.AppImage ./Banners-of-Yunhe-1.1.0-linux-x86_64.AppImage
The desktop edition makes no network connections.