Can anyone tell me where to get this safely?
I am 92 so for give me for asking what may be a simple question for the technology minded.
I'm not sure why you want to open the copy your downloaded unless you need to look at it without an internet connection.
.ged (called Gedcom) is a common file format for family trees. You can open the file is almost any family tree software program you install on your computer. Many family tree programs are free such as 'My Family Tree'.
I've noticed that if I open the saved Gedcom in other programs, I don't see everything I had in TribalPages. But I do download a copy when I make a lot of changes, in case I mess up something in TribalPages, then I can upload the last saved version I have.