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I understand that the issue has been over a year. There are many fakes in the network. Can someone help me to find the original one?
Seems like you can only access it via TOR but it's of no use now since they're out of service.
Quote from: https://en.bitcoin.it/wiki/Helix_light
Grams ceased operations on December 16, 2017 (PGP signed verification by gramsadmin). Any site claiming to be operating the Helix Light mixing or tumbling service is a fake and you will be scammed out of any money you put into it.
If you need a mixer, take a look at this list: 2018 List Bitcoin Mixers Bitcoin Tumblers Websites.
But If I were to recommend a mixer, it would be chipmixer (check my signature). It's reputable and offers unique and effective way of mixing.