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Can someone tell me how I can play nightmare mode?

(+1)

It's not updated

I was confused because a lot of youtube videos had titles saying 'hard mode' or nightmare office

Because they found a way to have "early access" from the code or something. It's not finished and mostly from what i seen on youtube the aesthetic changed which is definitely not the end product of that mode. 
Above the download button are all the posts the developer makes including updates. If you follow the dev on itch.io you will also get a message if they posts something.