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But it seems GG also has heartbeats, I'm not sure, but after 5-6 mins you get disconnected. I tried to bypass this too, but after this time, instead of Client closes, game just loose connection; but you can just change channel and it will work again.
Anyway, you can use it for client analysing, trainer testing, and everything else without GG.
So, enjoy!:D
Updated 09-09
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Thanks to emnamdna for unpacked.