He initially denied the rumors. It's in his Wikipedia page, and here's an article from Sep 2017 where he is denying them - https://www.hollywoodreporter.com/news/general-news/louis-ck-declines-discuss-sexual-misconduct-rumors-ny-times-interview-1037911/

You can read the apology itself here - he never actually says "I'm sorry" or "I apologize" - https://www.bbc.com/news/entertainment-arts-41950043

This is a criticism written of the apology from then: https://qz.com/1126593/we-edited-louis-cks-statement-on-sexual-misconduct-to-make-it-a-real-apology

Don't be an ass and say 'nothing you said is true' when the receipts are so easy to find.

And find better role models than losers like him.