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These instructions install a full system (base plus all addons) in the default location, for Windows.


1. Download and run the Windows All-in-One Installer:


You will be asked to choose between an installation for all users or 'just for me'.

Choose Installation Destination

Installing 'just for me' produces an unshared installation (by default to your user directory C:\Users\Fred) and does not require admin privilege, either during installation or during later upgrades.

A shared installation (by default to C:\Program Files) requires admin privilege, both for the initial installation and for subsequent upgrade to addons. That is, you will have to Run as Administrator any time you want to upgrade J packages if you install into a shared directory.

Finish Installation

Do the following to create a desktop icon for jconsole:

run Jqt (click green Jqt icon on Start menu)
   load 'pacman'
   'shortcut' jpkg 'jc'
   exit 0

Be sure Jqt is closed so the next step works properly.

Do the following to update your system to the latest:

run Jconsole with new jc901 desktop icon (right click and Run as administrator if shared install)
   'install' jpkg '*'
   exit 0

Update Addons Later

Perform the following steps in the Jqt window to bring the addons up to date.

  • Make sure you are connected to the Internet.
  • Select Tools|Package Manager from the menu.
  • Press the Updates button.
  • Press the Not Installed button.
  • Press the Install button.

(optional) Change Default Folder Names

J needs directories to store temporary files, configuration files and so on. By default these are in a folder under the User's home directory, named like:


To change the folders J uses, follow the instructions here.

(optional) Qt IDE Setup

See Qt IDE/Install for more information on setting up the Qt IDE.