I went looking for other software options as well. I can also confirm that the NZXT Cam software does work, the Pump is greyed out but you can set it to "fixed" or "performance" and it seems to control it. Fan speed seems to work well and can be tied to CPU, GPU or Fluid temps.
I also found this project:
While it's definitely aimed at Linux, I was able to get it successfully working on Windows. I grabbed the pre-compiled Windows release, and had to replace the Driver in use the Zadig utility. Selecting the 690LC device in Zadig, and replacing the driver with WinUSB, allowed liquidctl to access and control it. The only downside I've found is that it only seems to operate on the fluid/liquid temps, not CPU. That's really what I wanted, so it suits me fine.
C:\tools\liquidctl-1.3.3-bin-windows-x86_64>liquidctl.exe status
Asetek 690LC (assuming EVGA CLC)
├── Liquid temperature 36.0 °C
├── Fan speed 1500 rpm
├── Pump speed 2910 rpm
└── Firmware version 2.10.0.0
Edit: Looks like the forum is stripping my link, search for liquidctl on github and you'll find the project.