The 26gb version was the older version. It had all samples in 16 bit and 24 bit separately which bloated the sample bank considerably.
There were also samples and patches for instrument doublings and combinations that they got rid of in the newer version. Many of them were pretty much redundant because there is little use for having e.g. an “octave doubling flute / clarinet” patch if you could just arrange it as such with the normal instruments.
Did you get a license key with the demo?