Merlin Project 4

Merlin Project 4 is only supported up to macOS 10.14

Merlin Project 4 is no longer under development, the version is supported until maximum macOS 10.14 (Mojave).
The current version of our project management software is Merlin Project 8.

Operating Systems

The versions are supported from the following operating systems:

minimum OS X 10.10.5 (Yosemite) until maximum macOS Mojave (10.14)

Using the software with a newer, unsupported operating system at your own risk!


You can download the latest version here: Merlin Project 4 - Version 4.3.20


Copy the app into your Applications folder and start it from there.

macOS Catalina: Install and update fails because this version is not notarized by Apple"Merlin" can't be opened because Apple cannot check it for malicious software. Download a fresh copy from our website, perform a right-click onto the app, select 'Open', and confirm by clicking onto 'Open'.


The license is a small file, not a license number or login to a license database. You can have your license file sent to you at any time. Simply use our online query.

Merlin Project creates a folder on your Mac for your user, where you can find the installed license:
~/Library/Containers/net.projectwizards.merlinproject/Data/Library/Application\ Support/net.projectwizards.merlinproject


Handbook for Merlin Project 4

Merlin Project on the Mac and iPad

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