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macOS tips and tricks

Get Nuclos running on a Mac: Gatekeeper, signed installers, the Nuclos macOS tools and where the JDK lives.

HOW-TO USER UPDATED: JUL 2026 APPLIES TO NUCLOS 4.2026.X

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Since macOS Sierra (10.12), stricter security often blocks unsigned apps – sometimes with the misleading message that the app is "damaged". These tips help.

Prefer signed installers

Newer installers are signed (nuclos-X.Y.Z-installer-macOS.app) and run with the "App Store and identified developers" setting. Unsigned ones are named nuclos-X.Y.Z-installer-osx.app.

Temporarily relax Gatekeeper

If the "Anywhere" option is missing, re-enable it via Terminal (admin account):

macOS security settings.

sudo spctl --master-disable

The setting resets after 30 days; prevent that with:

sudo defaults write /Library/Preferences/com.apple.security GKAutoRearm -bool NO

Security

These steps lower system security. Use them deliberately and prefer signed installers.

Nuclos macOS tools

Small helpers for a locally installed Nuclos (require an installed JDK):

The Nuclos macOS tools (DMG).

Nuclos Installer Starter – drag a macOS installer onto it to run with admin rights.
Nuclos Server Starter – drop a Nuclos HOME directory to start the server with user rights.
Nuclos Desktop Client Starter – starts the standalone client (DE) (no Web Start).