The fetched content for this article is just PC Gamer's site navigation, membership prompts, and menu links — there's no actual article text about Halo: Campaign Evolved's release times or early access. I can't produce an accurate summary from this, since doing so would mean fabricating details not present in the source.

Could you paste the actual article text, or check if the URL is loading correctly? I don't want to guess at release dates/times for a game and present them as fact.