I've downloaded En-Fem No. 9 Reborn by silk savanna but I can't get it to play on my computer. can anybody guide me on how to get it working?

A link would help. What exactly is causing you trouble? And why not ask on the game page?

https://silk-savannah.itch.io/en-fem-e-no-9-reborn I have downloaded the game but can not get it to run on my computer. I don't know where to ask and I will admit I'm a bit dumb when it comes to these things. I just want to play the full game. 

The full game costs money, did you buy it? And it says right there on the game page:

For issues, questions, and concerns please email - SilkSav.CS@gmx.com

(Emphasis theirs.) This is your best bet.