CalcFiSH-2.1.0.x-Linux-x86-Install.gz is gzipped Linux installer for HCM-FS

First, please ungzip the file.
Then execute it as user, not root, and install into user's HOME dir.
This install does not contain HCM calculation library. After CalcFiSH is installed
go to "Download and Update Centre" and download HCM calculation library.