Steps to update an installation of XL C/C++ V8.0 in a non-default location (for advanced users)

If you want to update an installation of XL C/C++ V8.0 that is not a basic installation, follow the procedure in either Installing XL C/C++ V8.0 to a single non-default location. or Installing XL C/C++ V8.0 to multiple non-default locations.