I have just found this post after updating from 3.18.77. I moved the corsair folder from Program Files (x86) to Program Files, but it didn't work. Then looking at 'services' found that the CorsairService was looking at the x86 folder.
I went into Regedit and changed the CorsairService path to "C:\Program Files\Corsair\CORSAIR iCUE Software\Corsair.Service.exe" and now it works.