Popup stopping me running DotPeek

When I tried to run DotPeek today I got a little popup saying:

This pre-release build of J
Please update to a newer '
http//www.jetbrains.com/(something else missing)

because the box wouldn't stretch big enough to see all the text.

Can someone tell me what it says and what it wants me to do?  I couldn't find a newer release on the site, if that's what it's trying to say.


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