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Nuclos on macOS: Gatekeeper security settings, signed installers, Nuclos macOS tools and the JDK location. |
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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.
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| colour | Green |
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| title | Updated: Jul 2026 |
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| colour | Grey |
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| title | 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.
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sudo spctl --master-disable |
The setting resets after 30 days; prevent that with:
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sudo defaults write /Library/Preferences/com.apple.security GKAutoRearm -bool NO |
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These steps lower system security. Use them deliberately and prefer signed installers. |
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).
Where is the JDK?
Usually under /Library/Java/JavaVirtualMachines. In the installer pick e.g. /Library/Java/JavaVirtualMachines/<jdk>/Contents/Home.
Related pages
Standalone Client (DE)
Client without Web Start.
Open →
System requirements (DE)
Java & co.
Open →
