Seems Microsoft made a bit of a mess of the fixed runtimes then! I checked out the download links for the Update 3 2015 runtimes previously and they still pointed at 24210. What will be interesting is whether Visual Studio 15 (2017?) currently in preview will get its own runtimes, currently it used the 2015 runtimes. The runtimes would have actually been part of Windows and be installed as Windows updates if it weren't for anti-competition concerns.
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If generaltel.dll is to be believed, it refers to the free disk space on, I think, either the System Reserved partition or the C:\ drive, but I'm not smart enough to figure out how to get DeviceCensus to do its thing when invoked by me, so I can't prove anything. Sorry for the noise (It's moot now since I've wiped my drive in preparation for a clean install, but I'd've probably been ineligible for this upgrade based simply on the fact that I'd blocked DeviceCensus.exe from running. Though I'm seriously debating whether I want to unblock it from my next install - looking at the amount of things it tallies, I seriously think it'd have no problem probing me if it could...)