How do I export my game for the Arcade?

When I export a game from Construct 3 I receive "Required file 'c2runtime.js' is missing from zip archive."

I use the Arcade option.

Did you check if there is the file "c2runtimes.js" in your zip file? If not, you should export your game again and see if it works... or try to disable the "minify script" option.

I think you are trying to export a C3 game that has no C2 runtime using, im not sure about this, but might be that the arcade section is still not up to date to accept C3 games that are using the C3_runtime, and is accepting only C2 games or games that are using the C2_runtime. To fix this you need to go to advanced in C3 project settings and change the runtime from C3runtime to C2runtime.

Make sure you don't use minify script i think it might cause problems with the arcade section (as samsuffi said), didn't used that section in a while it might of been fixed by now.