The C2 home page says not to download r83, because it's unstable, but in order to post games, I have to download r83! What should I do?
Yeah, I ran into that problem too with my memory match tutorial example. Hopefully they'll soon decide R83 is stable and make it a general release.
I'm pretty sure Tom will soon enable the arcade games to be made with either the latest stable or beta release.
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For technical reasons we can only support one version of Construct 2 for the Arcade, so we only support the latest version.
It doesn't say that you shouldn't download r83 - it just says beware, because it's a beta release and may have some problems.