Sourcecode can apparently be found here:
https://github.com/iridiumcash/Iridium/blob/4090565ce48e01fed5aa72ae113eb15b0fe10c05/iridiumcoin%20SourceCode%20Final%20(1).rar
and/or here:
https://github.com/iridiumcash/Iridium/blob/ca164738a9e1fb0295aa728d6427b1694e979ee7/iridiumcoin%20SourceCode%20Final%20(1).rar

Why they would delete the file from their github is beyond me, not to mention the very untraditional approach of having the sourcecode in a rar-file instead of directly on github. Also it's funny how OP won't address any of the issues.