Enderman
(Enderman)
9
He’s a busy guy and sometimes takes a few days or weeks to reply.
If you bug him several times then maybe he will get annoyed.
Try waiting longer because he’s having some health problems recently.
Also, he is just a modder like the rest of us, not a company that provides warranty and 24/7 support, so maybe change your expectations a little.
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PS- I have bought a $400 custom driver from him and it works great.