In your post #13, you refer to files downloaded, files plural. The site I linked to which you indicate is the same on had only one file and that was a bash script. In your post #14, you indicate this file is in /usr/local/ and is named openfitness. When I downloaded it, I got the single file below. Is this what you have?
If it is and it is in /usr/local, log in to a terminal as root user and make it executable. Owner:group for /usr/local is root:root which is why you would need to log in as root.
At the root prompt type: cd /usr/local/
Next as root type: chmod 755 openfitness_unix_1_0_0.sh - or whatever the actual name of the file is.
This will make it executable for all. You could also move it to your /home/user directory.