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This gives detailed installation instructions for Windows. If you want a simple installation, go to the Quick Start Guide to start installation.

To start with, you may install either the Base system (without the Qt IDE) or the All-in-One system (with the Qt IDE).

The default installation folder is under the User's home directory. Admin privilege is not required to install here, for example:

  C:\Users\elmo\j804            J 32-bit
  C:\Users\elmo\j64-804         J 64-bit

For a shared installation, you may install in a protected folder path such as C:\Program Files\j64-804. This requires admin privilege, and will also require admin privilege for updates.

Base System using Jconsole

Download and unzip the appropriate file, then move the folder to the final destination:

To start Jconsole, use Explorer to browse to the J installation directory, then run jconsole.cmd. See readme.txt for instructions on creating a suitable shortcut.

  • download the appropriate file:
  • Go to Windows Explorer and navigate to your Downloads folder. Then:
    • double-click the zip file you downloaded
    • follow the prompts to install J into the folder j64-804
    • drag the new j64-804 folder and drop on C:\Users\Fred
    • navigate to C:\Users\Fred\j64-804\bin
    • double click jconsole.exe to start J
      • If a Security Warning dialog is shown, clear the 'Always ask' checkbox and press RUN
  • (optional) install all addons, install Jqt ide, and create desktop launch icons. Run the following lines one at a time in the jconsole window:
load '~addons/ide/jhs/installer.ijs'
installer 0
exit 0

After you install the base system, install any addons you want.

If later on you want to install the Qt IDE, then load J and run:

   install 'qtide'

All-In-One System

  • Download and unzip the appropriate file. You will be prompted for the final destination:
  • You will be prompted for a location to install under. Note that the folder you select is not the folder that J will be installed in. The installation will create a new folder in the location you specify, and install J in this new folder. The name of the J subfolder is j804 for 32 bit, or j64-804 for 64 bit systems.
    The default installation location is under HOME.
    This also creates a Program Group j804 or j64-804 with icons, each of which is a large letter J:
    • the green icon (titled JQt or JQt64) loads Jqt
    • the yellow icon interrupts a running J program
    • the gray icon runs Jconsole
  • Run JHS if you like.

Continue with the next section to install any addons you want.

(optional) Install Addons

To install or update any addons, do one of the following:

1. in Jqt, select Tools|Package Manager from the menu, select the addons to be installed (or Select All to get them all), and press Install.

2. in the J console, use the Package Manager console interface.

(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:

  C:\Users\elmo\j804-user            J 32-bit
  C:\Users\elmo\j64-804-user         J 64-bit

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