HarnessLaunch Won’t Start? The Three Problems People Actually Hit

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Almost every support request falls into one of three groups: the installer does not start, the agent cannot read your project, or your changes never reach the disk. Each one has a single usual cause, and each fix takes about a minute.

Problem 1: The installer does not start

Symptom: nothing happens when you run HarnessLaunch_Setup_v1.0.exe. No window, no error.

One thing to get out of the way first: the download is a ZIP archive. Unzip it, then run HarnessLaunch_Setup_v1.0.exe from inside the folder.

Cause: Windows SmartScreen, or your endpoint security tool, is blocking a publisher it does not recognise. This is normal for any new installer from a small publisher. Windows has not seen enough downloads of this file to trust it yet.

Fix:

  1. Right-click the installer and open Properties.
  2. On the General tab, tick Unblock, then click Apply.
  3. Run the installer again as administrator.

If it still does not start, your endpoint security tool is the next suspect. Corporate antivirus products often block new installers by policy, and that is a setting your administrator controls, not something the installer can work around.

Check the file first. Before you unblock anything, confirm the download arrived intact by comparing the installer’s SHA-256 checksum with the value published on the download page:

4179CF8E3444078F355794823D6E4B17AA4D0D7ACE6B29A1BB368CE06D9DBF62

On Windows you can compute it with certutil, which works in both Command Prompt and PowerShell:

certutil -hashfile HarnessLaunch_Setup_v1.0.exe SHA256

If the two values match, you have exactly the file we published.

Problem 2: The agent cannot read my project

Symptom: file reads fail, or come back empty, even though the files are clearly there.

Cause: the folder sits outside the approved workspace, or system permissions protect it.

Fix: move the project into a normal user folder — something like C:\Users\YourName\Projects\ — and open that folder again as the workspace root.

Two places cause this most often:

  • System folders. C:\Program Files, C:\Windows and similar locations are protected. An agent working inside them will be blocked, correctly.
  • Cloud-synced folders. OneDrive and similar services can lock files or expose them under a virtual path that does not behave like a local folder.

A normal folder under your user profile avoids both.

Problem 3: Changes are rejected or not applied

Symptom: you approved a change, but the file on disk still shows the old content.

Cause: the file is open and locked in another editor, or the write was declined.

Fix: save and close the file in the other tool, run the step again, then approve the change.

Editors that hold a file open with a lock — many IDEs do this by default — will silently win the race against anything else writing to it. Close it first, then approve.

Still stuck? Send this

If none of the three fixes helps, email [email protected] with:

  • what you did, step by step
  • what you expected to happen
  • what happened instead
  • the exact error text, copied rather than retyped

Those four things turn a two-day back-and-forth into a single reply.

HarnessLaunch runs DeepSeek Harness on Windows with one click. $4.57, paid once, no subscription. No account, no activation code. If it does not work on your machine, you get every cent back within 14 days.

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