While the official government version may have restrictions, many "Transport" clones are available for free under the Open Government Licence or SIL Open Font License.
: If your site or service is not an official part of the UK government, you are not permitted to use GDS Transport. This is to prevent public confusion between official and unofficial services. gds transport font free download better
For 99% of users who are not designing motorway signage, Overpass or Public Sans will look better than a pirated 1990s TTF of Transport. Open-source fonts have hinting, kerning tables, and variable weights that old versions of Transport lack. While the official government version may have restrictions,
If you want the same high-legibility, humanist sans-serif look without the licensing legalities, these free alternatives are widely recommended by designers: 1. Inter (Best Modern Alternative) For 99% of users who are not designing
You do not need to "download" a file to install it manually. Instead, you implement it via code. This is the intended use case.
While the web font is open, the actual for you to install on your Mac or PC to use in Photoshop or Figma are not publicly distributed for general commercial use.
The UK Government has made the design system open source. This means that if you are building a website or application and want to use the font , you are free to do so under the Open Government Licence.