BCML is a bit difficult to install on Steam Deck. So I made this useful install script.
Miniconda is required, since Steam Deck uses an immutable filesystem and the version of Python installed on it is too high for BCML. Get the required version of Miniconda here.
Download the .desktop file below and move it to your desktop. Then, double-click it.
The .desktop file downloads the installer script directly from the main branch, so it will always use the latest version.