HELP!!! I can't Install Ardour 3

I just bought and download the tar file. I followed the directions, extracted the file but cannot run the file.

brandon@brandon-VPCCW21FX ~/Programs/Ardour3-3.1/tools/linux_packaging $ sh ./
./ 25: ./ /home/brandon/Programs/Ardour3-3.1/tools/linux_packaging/ not found

Help would be much appreciated

Don’t know if it is a shell compatibility issue, but if it is, it can be avoided by removing ‘sh’ in front of the command.