It is something exceptional. Our users NEVER reported error messages of the setup of Atlantis Word Processor. Could you attach a screen capture of the entire setup window, or email it to support@AtlantisWordProcessor.com
Maybe the setup file is corrupt. Please check its size. It should be 3,348,006 bytes (version 1.6.5). If possible, please zip & email your setup file of Atlantis to support@AtlantisWordProcessor.com
Please try running the online setup file of Atlantis Word Processor:
Do you get the same error message?