For developers or those needing raw dictionary data for software like StarDict or Aard2, the repository on GitHub is a primary source.
It includes open-source Spanish-to-English dictionary files in .slob and other formats. 3. Digital Archive Dictionaries (Internet Archive) Download Spanish English zip
The full parallel corpus is spread across multiple ZIP files. You must download all files from the DGT-Translation Memory page to get the complete set. For developers or those needing raw dictionary data