What source to use is depending on what you own.
Phase One Premium support which is available here:
Http://support.phaseone.com
This is available for owners of
- * Phase One camera equipment
* Mamiya-Leaf camera equipment
and
* Holders of a valid Phase One Certified Professional (POCP)
Capture One support which is available here:
https://support.captureone.com/hc/en-us
This is available for anyone using Capture One but do fulfill the above criterias.