The other is 64-bit and currently used only for ArcGIS Pro. One is 32-bit and used for Desktop, Server, Engine, etc. There are two versions of the data setups. At some point, we'll likely move the existing NADCON/HARN/NTv2 files from the core setups into this separate setup, but there's no timeline for that yet. It also allows customers to decide to not install everything if they want. So with geoid models coming from several countries, and more grid-file-based transformations all the time, it was decided that we've start a separate setup for that data. We had discussed making a separate data install years ago, when the ArcGIS Desktop install was creeping towards requiring either another CD or maybe a DVD, but managed to scrape through. Adding even the 2.5'x2.5' EGM2008 and the GEOCON files is close to 0.5 GB. Particularly for ArcGIS Pro, we're trying to keep the core setup as small as possible.
I was specifically tasked with writing a white paper/blog posts/etc.
I didn't get my act together to get a longer topic into the help for ArcGIS Desktop/Server 10.5 or ArcGIS Pro 1.4.
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