Is the file size realistic for what you are installing? (An installer that is only a few kilobytes is highly suspicious).
If you have exhausted all password-finding methods and still cannot access your JavaKiba RAR file, password recovery software may provide a solution. However, note that this approach requires significant time and computing resources, especially for strong passwords. rar password list for javakiba install
Good luck with your JavaKiba installation, and happy Java programming! Is the file size realistic for what you are installing