Optuma 1.6 version can be downloaded from this link.
https://mega.nz/file/WUoHWKiL#FkKOsyL13Cy3RHY8VQO98sAB4ZXMBglppulSTCaFK7I
For me it wasn't working, but from the original forum (tsrh), its working for most and not working for a few. I have tried to close port 80 but still no clue. And dont ask for help if not working. Its provided as is -:)