Installation

One command on Windows. macOS and Linux coming soon.

Windows — one command

Open PowerShell and paste:

powershell

iex (irm https://yumii.me/install.ps1)

That's the whole install. It sets up four things:

Step	What	Size
1	uv, the Python manager (skipped if present)	tiny
2	A private Python 3.12 + Yumii's backend from PyPI	a few hundred MB, one-time
3	The desktop app (`Yumii.exe`)	~9 MB
4	A Start Menu shortcut	—

No Python needed beforehand, no Rust, no build tools. When it finishes, launch Yumii from the Start Menu — the Quickstart covers what happens on first launch.

Updating: re-run the same command. It upgrades the backend and app in place; your settings and memory are untouched.

Locked-down machines

The installer handles PowerShell's Restricted execution policy automatically (common on fresh consumer laptops). If a very old copy of the script fails at step 1, just re-run the command — the current script is served live.

macOS & Linux

Coming soon. The desktop app ships for Windows today; the macOS and Linux shells are on the roadmap. (Developers: the backend itself is cross-platform — see Running from Source.)

Uninstalling — completely

Quit Yumii from the tray first, then in PowerShell:

powershell

uv tool uninstall yumii                                  # backend + command
Remove-Item -Recurse -Force "$env:LOCALAPPDATA\Yumii"    # the app
Remove-Item -Recurse -Force "$env:LOCALAPPDATA\com.yumii.desktop"  # window (WebView2) data
Remove-Item -Force "$env:APPDATA\Microsoft\Windows\Start Menu\Programs\Yumii.lnk"
Remove-Item -Recurse -Force "$env:USERPROFILE\.yumii"    # memory, keys, models

The last line is her memory and your keys — skip it if you might come back; everything survives a reinstall. Full layout in File Locations.

If uv was installed only for Yumii

uv is a general Python tool other programs may use. If Yumii was the only reason you have it, you can also remove %APPDATA%\uv, %LOCALAPPDATA%\uv, and uv.exe / uvx.exe from ~.local\bin — after the uv tool uninstall step, never before.

Next: the Quickstart — first launch, one key, first conversation.