The videos in the guides won't play for me. Just wondering if it is my computer's problem or is it that it just won't work. If it doesn't work, can the creator of the guides try to fix it?

The creator of all the guides is GarlicBox. A member of the community who has been banned on speedrun.com and with time lost interest in speedrunning all together and deleted his src account, and youtube channel. Those videos don't exist anymore. I thought of removing the guides, but there's quite a bit of history in them, so I decided to leave them for now, and maybe create an actual guide myself in the future. For now, the best way to learn the game is watch speedruns by other players, and ask questions in the communitys discord. All of the best players are active on there.

Here's a playlist with all the stuff you need to know to run the ILs https://www.youtube.com/playlist?list=PLmlh8SO7jS6nOGcC9FESFymSL2ClsTiU4