HOWEVER, I CANNOT EXPORT FROM OLD VERSION OR IMPORT FROM NEW VERSION due to all the years of upgrades between versions.
You shouldn't be trying to Export or Import anything. Have you tried simply opening the old InDesign document via File>Open?
By Book are you referring to an .indb book file, which is a panel that shows a collection of InDesign documents, or a normal InDesign document, which would have the .indd extension?
FWIW, I still have some InDesign 1.0 files around that I have absolutely no problem simply opening in the latest version of InDesign. Just “open” — there is no need to do any import or export operations.
I am beyond grateful for this answer that worked beautifully! God bless you--especially in all your InDesign work! :-)
Thank you, Rob Day! You were right!!! It worked!!!