Download HarnessLaunch
HarnessLaunch for Windows. One installer, one window, one click to start DeepSeek Harness.
Latest release
HarnessLaunch 1.0 for Windows
| Version | 1.0 |
| File | HarnessLaunch_Setup_v1.0.zip |
| Size | 2.08 MB |
| Platform | Windows 10 & 11 (64-bit) |
| Released | 2026-09-19 |
| Price | $4.57, one-time |
After payment you get an email with your personal download link. Keep that email, because the link stays valid: you can download version 1.0 again at any time. If HarnessLaunch does not work on your machine, write to us within 14 days and we will refund you in full. No explanation needed.
Verify your download (optional)
If you want to confirm the installer arrived intact, compare its SHA-256 checksum with the value below.
SHA-256 4179CF8E3444078F355794823D6E4B17AA4D0D7ACE6B29A1BB368CE06D9DBF62To compute the checksum on Windows, open PowerShell in the folder you downloaded to and run:
certutil -hashfile HarnessLaunch_Setup_v1.0.exe SHA256What’s included
- HarnessLaunch: the Windows application that starts, updates and removes DeepSeek Harness.
- Automatic setup: HarnessLaunch handles the required setup for you.
- Run DeepSeek Harness: starts the local server and opens it in your browser once it is ready.
- Update: checks for a newer DeepSeek Harness package and installs it.
- Uninstall: removes HarnessLaunch and DeepSeek Harness from the computer.
- No command line: nothing to type, nothing to configure by hand.
System requirements
| Operating system | Windows 10 or Windows 11, 64-bit |
| Architecture | x64 |
| Disk space | Roughly 500 MB free, including the DeepSeek Harness files |
| Memory | 4 GB RAM minimum, 8 GB recommended |
| Browser | Any current browser (Edge, Chrome, Firefox) |
| Network | Required for the first setup and for updates |
| Privileges | Standard user; the installer may ask for confirmation |
You don’t need to install a development toolchain by hand. HarnessLaunch handles the setup and tells you if something is missing on your machine.
Installation
- Buy HarnessLaunch with the button above, then open the download link from your email.
- Unzip
HarnessLaunch_Setup_v1.0.zip, then double-clickHarnessLaunch_Setup_v1.0.exeinside the folder to start the installer. - Windows may show a security prompt, because this installer is not yet code-signed. Click More info, then Run anyway. You can confirm the file is intact using the SHA-256 checksum above.
- Follow the prompts and finish the installation.
- Start HarnessLaunch from the Start menu.
First launch
Open HarnessLaunch and press Run DeepSeek Harness. HarnessLaunch starts DeepSeek Harness, waits until the local server is ready, and then opens it in your default browser. There’s nothing to configure first.
The first run takes a bit longer, because the DeepSeek Harness package is being prepared. After that, launches are quicker.
When you’re done, close the browser tab. To keep DeepSeek Harness current, press Update from time to time.
Version information
| Version | Released | File | Notes |
|---|---|---|---|
| 1.0 | 2026-09-19 | HarnessLaunch_Setup_v1.0.zip | First public release. One-click launch, update and uninstall for DeepSeek Harness. |
Release notes for later versions are published under Updates.
Troubleshooting
The download does not start
Some browsers block downloads from a new site until you allow it. Check the download bar or the browser’s download list and allow the download if it was blocked. If it still fails, try another browser.
Windows warns about the installer
Windows SmartScreen warns about files that have not been downloaded often yet. Verify the SHA-256 checksum above, then choose the option to run the installer anyway. If the checksum does not match, delete the file and download it again from this page.
The installer will not start
Make sure you are on 64-bit Windows 10 or 11. If the file was blocked, right-click it, open Properties and check for an Unblock option at the bottom of the General tab.
DeepSeek Harness does not start after installing
See Troubleshooting in the documentation for the local server, browser and update problems.
Need help getting started?
The documentation walks you through the first launch, everyday use, and the things that most often go wrong.