Radiant is licensed in English by (now Crunchyroll) and available on Netflix in select regions. Downloading a .zip of a fansubbed HEVC encode exists in a grey area.
Because this series is 50% French and 50% Japanese, the fan-encoded HEVC version often allows you to switch between both language tracks easily. Download - -ZikAnime- Radiant S1 720p HEVC.zip
If you do choose to download the file, make sure to use a reputable torrent client, have an up-to-date antivirus program, and exercise caution when accessing file-sharing sites. Radiant is licensed in English by (now Crunchyroll)