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I love this game. I just bought the DLC last night but not sure how to install it.  Any advice or instructions would be greatly appreciated 

There's installation instructions in the DLC zip file. But to summarise. Extract the zip file and copy the extra.rpa file into Nekojishi/Game/<extra.rpa here> and it should be active when you start the game next. (To check it's working just check the gallery to see if the new CG's were added)

same its not working