hi!!!!! i’m an actual librarian who has encountered this very situation before!!!!! and while i commend & admire op’s willingness to help another patron, this is why you really really should have a library worker, not another patron whom you don’t know, assist you with tech & information related issues in the library!!! because we are trained in how to handle this exact sort of thing
tl;dr: use proton mail. i’m not gonna gatekeep this info. it does not require a cell phone number, so it’s my go to for patrons in this situation!!! while i am acutely aware of the harm done by the digital divide & how many people are getting left behind as our world gets increasingly tech dependent, the situation is not hopeless. there ARE provisions in place to help the people most affected, and those provisions are usually wearing glasses & cardigans & sitting behind the circulation desk
librarians are not glorified bookworms!!!! we are information professionals who are highly trained in how to handle these sorts of seemingly impossible binds!!!! ask us for help!!!!!! as i always tell my patrons, that’s what i get paid the big bucks for