Slitherine

I Just Downloaded the full version of commander europe at war game & also got the extended download service.
How does the extended download service work???
Does it automatically save game files to Slitherine?

This is a service provided by Digital River, not Slitherine. They offer it on everything they do and it's not something we can control. I'm not sure exactly how it works, but the basic idea is that it stores your purchase for download at a future date - I don't know how long it lasts for. Sorry I can't be more help.