You must patch the "Snap Camera.exe" file and not your installer. Be sure to have Snap Camera installed before trying to patch anything.
Do NOT run the patched file after applying the patch. You must move the patched Snap Camera file into "C:\Program Files\Snap Inc\Snap Camera", rename the original, and then rename the patched file to match the original name. If you get stuck, please watch the video. Pause the video as you watch along and follow it step by step.