According to the data & downloads, 2012 Civil 3d SP4 / Update 4 was released on 10/24/13 and Update 1 was released on 10/28/13?
Kind of confusing, but Update 1 readme makes no mention of prior Service Packs included where SP4 mentions you must have applied 2.1 and 3 previously. Seems to be the old SP1 with a new reissue date AFAIK.
C3D 2018.1
C3D 2016 SP4
Win 7 Professional 64 Bit