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To download a single pre-translated file, go to the file and click the Download button.
To download multiple pre-translated files in a single zip file, go to the project, select one or more files, and click the Download button above the list of files.
To download all pre-translated files in a single zip file, go to the project and select Files > Download all translated files.
If you have uploaded all the files in one zip archive, the downloaded zip file will have the same directory structure.