I'm really unfamiliar with the process of the custom building, and am trying to implement some in app purchases with GodotGooglePlayBilling, the issue is, due to my local network settings, Godot can't download anything (this happens with export templates, so I just downloaded them manually and installed from file). For the custom build, it gets stuck on downloading gradle, and then fails (obviously). I've downloaded the zip that it is trying to install, where do I unpack it?
TLDR: How do I manually install gradle for a custom export, where does the zip file go?