Megaraph6

Is it possible to install mods with the current version without downgrading KSP to older versions? The mods I would want to install are Realism Overhaul and kOS or even possibly kRPC. Looking forward to an answer. I'm also new to this forum so I quite don't know what to expect yet, if you guys are willing to recommend content to read on this forum, I'd be happy to know :))