Your download is starting.

Windows will say it protected your PC

Neuron is not signed with a paid code-signing certificate, so Microsoft Defender SmartScreen does not recognise the publisher and blocks the installer on first run. It is a reputation check, not a virus scan — a brand-new certificate would trip it too.

Or avoid it entirely: the Microsoft Store build is signed by Microsoft after certification, so there is no warning to get past and the Store handles updates. It is the same application.

choco install neuron also works, from an elevated prompt. Chocolatey checks the download against the checksums published with the release before it runs anything — but the installer it runs is the unsigned one, so this dialog can still appear.

1. Click “More info”The small link in the dialog body. Nothing happens until you do — there is no “Run” button before this.
2. Check the publisher lineIt should read Unknown publisher and name the file you just downloaded. If it names something else, stop and delete it.
3. Click “Run anyway”This button only appears after step 1.
4. Install as normalYou will not see this warning again for this version.

# Proves this file came from Neuron's CI, not someone else
gh attestation verify Neuron-win-x64.exe --repo neuron-workspace/Neuron

macOS will ask you to confirm before opening

Neuron is signed, but not notarized with an Apple Developer ID, so Gatekeeper stops the first launch and says “Neuron can’t be opened because it is from an unidentified developer”. That is the expected prompt for software Apple has not been paid to vouch for, and the steps below clear it permanently.

Or skip all of it: brew install --cask neuron-workspace/neuron/neuron installs the same build without the prompt. Homebrew clears the quarantine flag on casks it installed itself, which is the supported way past Gatekeeper — unlike running xattr by hand on something you did not build.

1. Drag Neuron to ApplicationsOpen the .dmg and move the app across as usual.
2. Right-click the app, then choose OpenRight-click — not a double-click. The same dialog appears, but this time it has an Open button.
3. If there is still no Open buttonGo to System Settings → Privacy & Security, scroll to the Security section, and click Open Anyway next to the message about Neuron.

Linux does not warn you — it just needs the right step

No signature prompt here. Which command you need depends on which file you downloaded.

AppImage

Self-contained, runs anywhere, no install. It only needs the executable bit.

chmod +x Neuron-*.AppImage
./Neuron-*.AppImage

Debian, Ubuntu and derivatives

sudo apt install ./Neuron-*.deb   # resolves dependencies

./Neuron-*.AppImage --appimage-extract-and-run