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?
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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.
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.