My Aquasuite external sensor readings were suddenly missing on Windows 10 for HWiNFO and all other tools. I don't know why I lost them but I tried everything WMI related (delete namespace, check security) and tried all external monitoring tools.
Thanks @Kyle_XY for pointing out the simple solution to just re-install Aquasuite:
I kept HWiNFO, I did a complete uninstallation of Aquasuite 2016-4, before re-installing it again.
And it's working again
In the newer Aquasuite versions you even have an integrated Aqua Computer Hardware Monitor which was also missing from my external sensor list.