I realize that GAM 3.71 is... old ;) and that "No support is provided for these commands going forward."... But:
Last year and each year before that it worked perfectly fine - i was able to use gam audit export requests and then download mbox files for each user's mailbox. It was a nice and cheap (free!) way of making a yearly mailboxes backup or just before deleteing some users.
But this year this old version of GAM just doesnt work. Even gam info domain is broken - nothing happens, not even an error message.
I tried setting up old GAM from scratch, but it seems something, i guess on Google side, changed so much it no longer works.
Is there still some way to use audit export requests/downloads?