Fixes the Windows build, which in v1.0.0 did not start. This release is verified on a real Windows machine in CI: full stdio handshake, all 14 tools, and a complete timeline built inside the bundle — same verification as macOS.
Install
Download the file for your computer, then in Claude Desktop go to Settings → Extensions → Advanced settings → Install Extension… and choose it. Restart Claude Desktop and Alto appears under Extensions.
| Download | For |
|---|---|
Alto-macos-arm64.mcpb |
macOS, Apple Silicon (M1 and later) |
Alto-macos-x64.mcpb |
macOS, Intel |
Alto-windows-x64.mcpb |
Windows, 64-bit |
Nothing else to install — each bundle carries its own Python.
What changed
- Windows works. Dependencies now install into the bundled interpreter's own
site-packagesinstead of aPYTHONPATHdirectory. pywin32 relies on a.pthfile, and.pthfiles only execute in real site directories — so v1.0.0 failed at import on every Windows machine. - Line endings are pinned LF and every file read declares UTF-8, so building from a Windows checkout produces byte-identical output.
- CI now builds the bundle natively on Windows and macOS and runs the shipped artifact before anything is released.
Checksums
7084d925da237a54a2955e6a220374a4495be90f7d799fa5af98ee8629f64052 Alto-macos-arm64.mcpb
2b04ed6de59bf7ca690bcc662e4cd790d887940c9de28c80d9473adba0db1139 Alto-macos-x64.mcpb
a465e1158b10b96ca1a37fa9c60c33c2f211bf838c63d8624fec15e0fa186523 Alto-windows-x64.mcpb
Apache-2.0. Timelines you build with Alto are your own work and are not covered by that licence.