Generally it's not necessary to uninstall the prior version of the following iGrafx products before installing a new version:
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FlowCharter
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Process
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Process for Six Sigma
iGrafx will attempt to retain many user preferences, including:
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Template directory pathname
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Auto recovery frequency
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Number of undo levels
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Snap to grid (on or off)
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Snap resolution
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Rulers (on or off)
If uninstall is run before installing iGrafx, then user preferences are reset to their default values.