If you are attempting to deploy Altium Designer 13.1.2 Build 27559 on modern hardware, keep the following compatibility factors in mind:
This build introduced more robust automation for adding stitching vias and via shielding, critical for maintaining signal integrity in high-frequency RF and digital designs. If you are attempting to deploy Altium Designer 13
If you are used to modern Altium Designer (Version 20+), jumping back to 13.12 feels surprisingly familiar but "retro." If you are attempting to deploy Altium Designer 13