Unfortunately the service is very buggy in my experience. When I tried to download all of my photos data multiple times it gave me corrupted .zip files and half of the files were just zero bytes. Maybe I can blame Firefox for that though, I dunno. I should probably try again with Chrome before completely blaming Google

I've never had a problem with Google Takeout the multiple times I've used it. Perhaps try making the compressed files smaller (You can choose to make them 1gb or greater, last time I used it), you might need to download 75 files, but it's better than 1 big file.