Email is the best way to get individual support. You can contact Black Horizon Studios at: Support@BlackHorizonStudios.com
Please include the following:
The asset you are, along with its version.
The version of Unity you are using, along with the pipeline.
A clear description of the issue or support question you have.
Black Horizon Studios' Discord has over 1,300 members and is a great way to receive community support: https://discordapp.com/invite/XpWYzjp
The threads through Unity's Official forums is another great way to get community and individual support. There is a thread for each Black Horizon Studio asset: