It looks like that’s an issue with the deck itself (if it’s this one? Reddit - Dive into anything) – reported by a number of people since the deck was shared 6 years ago. It might not work at all.
Otherwise, since that was before Anki 2.1 released, the file might not be compatible with a recent version of Anki. There is an add-on for Importing .anki (old anki 1) files that might help you. But you can’t use the add-on with a recent version of Anki, so you’ll have to “Downgrade & Quit” so you can install an older version of Anki to use it (the add-on page shows the compatible versions). And heed the author’s advice to keep your collection safe.
Perhaps start by asking yourself … is this all worth it for that deck?