Eventually, all good things come to an end. It seems that Spectraview has been updated to be 64-bit compatible, but the old NEC/i1 v2 Colorimeter is 32-bit and is no longer supported under 1.1.4 or any update going forward. It looks like you can choose between the X-Rite i1Display, i1Pro, i1Pro2, i1Monitor, i1Studio, and ColorMunki, and the Datacolor Spyder3, Spyder4, Spyder5, and SpyderX.
I'm looking for the cheapest colorimeter that I can get away with that will give good results. I'm on macOS now, but I would prefer a profiler that will work with Windows as well in case I jump platforms. At the point I only need it to calibrate monitors. Any recommendations?