Unziping the CSX-1_3.zip file produces two first-level folders: csx and csx-1_3. In the csx folder look for a README.txt file that gives manual installation instructions. This might work for you instead of running the InstallCSX script. (I installed my csx last year and have forgotten if I used the script or manual installation.)

The manual install procedure also is in the CSX.pdf documentation file in the csx directory plus more info on files in the package.