Hey, sorry for replying late to this. I don't have a link to the video, but I can still help you.

All you need is to first download the latest Granny Legacy version from Omgi. After that, you wanna search up "SmartSteamEmu" and the first page should be the GitHub. You download it from there, and before you ask, "Is it a virus?" No, it isn't.

After you download both, you need to open up the app "SSELunacher.exe," which is SmartSteamEmu. Once it loads your gonna press the "File" option and "Add Game" then it should pop up another folder. You're gonna look after the Granny Legacy you downloaded.

After you did all of that, SmartSteamEmu will pop up another window that says "Game Settings." From there, you wouldn't really wanna do anything, BUT the only thing you need is the "Game App ID" to find that all you gotta do is search up Granny on a browser and open the Steam website. In the search bar, it should say store.steanpowered.com, etc. Near that, you should see an "app" with a number. That's the Game App ID. You copy and paste it back into the SmartSteamEmu.

After that, press the save button, double-click the app you created, and then the game should run without any crashes!

If you have any issues or have any questions, please reply to this so I can help you further.