Can't restore my backup!!!

Well, I've recently bought Sins of a Solar Empire and its expansion
Entrenchment.

Now, my problem is that I've downloaded both games using the "Download
and archive" function, so to keep a backup of my games and when I try
to restore the backup of the base game it show me this error:

"The archive could not be restored"

But when I try to do that with the expansion file it works.

So now WHAT CAN I DO!?!?!? I bought this games as my gift for my
birthday, and now none of them works!!!!?

Could the technical team support me please!?

Thanks in advance.

David Ulises Romero Avila

PD. Also, would the Stardock support can checkout my tickets!? There I explain other situations I have.