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Please notice that GanttProject **requires Java Runtime** which is NOT included into this package. You need to download and install Java Runtime separately. There are many Java Runtime vendors. We recommend using Amazon Corretto Java Runtime version 8 or version 11.
We hope you will enjoy working with GanttProject. However, if you are not happy, please send us an explicit request to refund your payment within 60 days (the sooner is the better). See https://www.ganttproject.biz/refund
If you need support, please start with our public support forum at https://help.ganttproject.biz
-- Dmitry Barashev, GanttProject @ BarD Software
Good news! Since you already have a Gumroad account, it's also been added to your library.