Thanks! The file was a good start for me/us...
I couldn't get the Digistore installation for the language file(s) to upload, so you'll need to:
(1) open the attached ZIP archive
(2) use your FTP application to upload to your administrator/components/com_digistore/language directory
(3) in your iJoomla Digistore component, select Spanish as your default language
Note that I elected to use Informal (tu) Spanish; you may want to edit the file if you prefer Formal (usted/su) Spanish. I am not a native speaker but did my best with the Spanish, and IMHO I think it is 90% correct.
It also was necessary to use HTML codes for the character set to appear correctly on my server and site. (Useful Link:
http://www.ascii.cl/htmlcodes.htm)
Hope this helps everyone and expands the business for iJoomla. Good luck!
John