JINC has no particular installation documentation because the installation can be done simply using Joomla! components installation tool that will install automatically the component and related modules and plugins.
By the way, if you had any problem in installation process you can write to me (firstname.lastname@example.org) or to JINC forum and I'll be happy to try to solve any problem.
I hope to hear you by mail or by forum ...
Best regards, Lhacky.