Hmm that's strange, does it happen every time you try open the game?
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I just tested it myself and works for me, there should be a ChopChop.7z in your downloads folder which you can unzip with 7zip. If there isn't you could try restarting your browser or reloading the page. You could also try clear the cache, here's a guide on how to do that: https://support.google.com/accounts/answer/32050?co=GENIE.Platform%3DDesktop&hl=...