You seem to of missed the big text at the top that says: "Downloads:how tf do I even download it ? there's no download button anywhere
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"Click "Releases", on the resulting webpage, expand the Assets section if it hasn't already, then click each module that you want plus the core file [alternatively: just grab the AIO file]
For a usable download of the current indev release, either use the
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or just grab the zip from here.EDIT: Added an underline to the releases link on both this and the mod post