You can download TNX Tower free trial version from the official DNV GL website:
Do not download any file labeled "tnxTower" from a site that is not the official vendor. Tower Numerics tnxTower Free Download
tnxTower is professional, commercial software and is not available as a free full version. You can download the installer directly from the official Tower Numerics website , but it requires a valid license file to operate. What is tnxTower? You can download TNX Tower free trial version
None of these match tnxTower’s specialized code-checking to TIA standards, but they work for conceptual design. but they work for conceptual design.