I was inquiring to start speedrun penumbra, but here I don't know where to go and what to do to get there, could you help me? :,(

There is a video made by cakeri where you can learn the basics of the game Here is the link to the video

no I meant I'm lost on the installation, I can't crack it and find the right patch for the right version

Buy the Steam version when it's on sale, it's the best thing to do