Hey everyone, have any of you installed GC with ZenCart 1.3.9?

My Specs:
ZenCart 1.3.9h, upgraded from 1.3.9f
I have a "pure black" template added on as well as a "grid product display".
My site is very simple and only uses Paypal, the shipping module is set to free shipping.

Site Address: www.thehustlelusionstore.com

My problem: I followed the tedious instructions of GC, putting files into directories, editing PHP files, etc. But GC does not show up as a payment module in my admin. I was very careful in checking that all the files went into the right places.

Can anyone please help me? I'm pretty new to this.
Also, how do I check if I have "libCurl" installed or enabled? I have no idea what that is.

Any help is appreciated!