GX Works is a commercial software – and not free-ly available. This makes sense, given the amount of features and functionality one gets with the software. Upon the purchasing of the license(s) – the software can be registered online.
Free updates are continuously available and freely downloadable. In addition to this, the full installation files can also be downloaded for free, but since this is a commercial product, a Serial Product key will need to be entered at installation.
This article will provide more details on where these downloads will be made.