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install4j offers two types of installers:
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Regular installer
This generates standalone installer. The following options related to updates are available for
regular installers:
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Suggest previous installation directory
If a previous installation can be detected on the computer,
the installer will suggest the directory of that previous installation.
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Suggest previous program group
If a previous installation can be detected on the computer,
the installer will suggest the program group of that previous installation.
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Add-on installer
This generates an installer that can only be installed on top of
an installation of a certain installation. An add-on installer doesn't have a
separate uninstaller. This is useful to distribute patches and enhancements.
If the add-on installer type is selected, you have to enter an application ID
for the base application in the text field below. With the [...]
chooser button, you can select an install4j project file from your file system,
and extract its application ID.
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