Write template_tags for download, see:

[models.py](https://bitbucket.org/biolab/orange-homepagex/src/02c91550c41fd8875a37ce8c7c2edf3b9f236d86/main/models.py?at=master) - download_choices(), DownloadPlugin
[cms_plugins.py](https://bitbucket.org/biolab/orange-homepagex/src/02c91550c41fd8875a37ce8c7c2edf3b9f236d86/main/cms_plugins.py?at=master) - DownloadPlugin