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I have found a gatekeeper for freya and i was wondering if i can use it on the H5 Stable. And also i oppened the zip file and i found several .html files one .sql and one .py. ok i know how to execute the sql. but how can i install this GK in the server?

you should ask about that in the same area/forum where you get that GK, this forum area is only for support about Server, not about custom features.