When a user downloads a distribution zip and unzips it to "_{" then all files should be below "}/optaplanner-disribution-8.0.0.Final", not directly scattered under ~.

Or put differently, the zip should contain a single folder (which contains many folders).

This

  <includeBaseDirectory>false</includeBaseDirectory>

should go back to

  <includeBaseDirectory>true</includeBaseDirectory>