I would assume that the servers handling the files for download are simply clogged up and bombarded by everybody who upgraded/purchased Superior Drummer 3.
Windows 10 Pro x64, 16 GB RAM, 512 GB SSD hosting Cubase and Superior Drummer 2/3, Cubase Pro 9.5 (x64), Mackie Onyx Blackbird FireWire ~10ms, Alesis Trigger IO, DIY Mesh-Head rebuilt Milennium MPS-100 Pads
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