The TI processors wiki where the download links for the GUI composer v1 (GCv1) runtime were stored has been decommission as of January 15, 2021.
The GCv1 download links have been moved to this website: https://software-dl.ti.com/ccs/esd/documents/gc_downloads_v1runtime.html
Please use the link above to download the GCv1 runtime.