There are 2 versions of Character Creator 3 available. One "free" version is included with the purchase of iClone and the other "Pipeline" version, is a "standalone" version that can directly import and convert characters exported from DAZ, Poser and Hivewire and export them for use in other software.
The "free" version can only modify Characters created in CC, and can not import assets from other sources.
The Iray plugin is only available for Character Creator at the moment, and is expected to be available for iClone sometime in Q1 2019. If you purchase the Iray plugin now you will get an update that includes support for iClone when it is released - this update will be made available at no extra costs.
System: Win 10 Pro (1903), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-441.28), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.