Short answer: open HarnessLaunch and use its Uninstall action. It removes HarnessLaunch and DeepSeek Harness together. Your project folders are untouched, and there is nothing to cancel.
Before you start
Three things worth knowing, because they are unusual:
- Your project files stay where they are. The agent only ever worked inside the folder you opened as the workspace. Uninstalling does not reach outside it.
- There is nothing to cancel. HarnessLaunch is a one-time purchase. No subscription, no account, no licence server that has to be told you are leaving.
- Your download link does not expire. If you uninstall today and want it back in six months, the link in your purchase email still works.
Step 1: Remove both with one action
Open HarnessLaunch and use the Uninstall action. It removes HarnessLaunch and DeepSeek Harness together — that is what the download page promises, and it is the reason there is nothing left to hunt for afterwards.
Use that instead of deleting folders by hand. A manual deletion leaves the package’s own files and configuration behind, and those are exactly the leftovers that cause a broken install the next time round.
Step 2: Only if the uninstall did not finish
If HarnessLaunch is still listed in Windows after using the Uninstall action, remove it the ordinary way:
- Open Settings → Apps → Installed apps.
- Find HarnessLaunch in the list.
- Choose Uninstall.
On Windows 10 the same list is under Settings → Apps → Apps & features.
What stays behind
- Your project folders. They are your files. Nothing in the uninstall touches them.
- The email with your download link. Keep it — that link is your way back in.
- Nothing else. There is no account to close and no subscription to end.
Installing it again later
Use the download link from your purchase email. Your purchase covers HarnessLaunch 1.0 permanently, so reinstalling costs nothing.
One thing to know: updates to HarnessLaunch itself are not included. You bought version 1.0 and version 1.0 is what you keep. The Update button inside the app is a different thing — it updates the DeepSeek Harness package, and that part is included as long as you are using the app.
If the uninstaller will not run
If nothing happens when you start the uninstaller, the cause is the same one that can block the installer: Windows SmartScreen or your endpoint security tool refusing a publisher it does not recognise.
The fix: right-click the file, open Properties, tick Unblock on the General tab, then run it again as administrator. The troubleshooting page covers this and two other common problems.
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.