I see I'm not alone in finding files that aren't downloadable. The file you're downloading isn't actually a zip or a rar, it's actually an error message that contains the following:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Error>
<Code>InvalidArgument</Code>
<Message>Backblaze does not support the 'x-amz-acl' header for this API call.</Message>
</Error>
The actual error code meant for this is 400 Bad Request, but due to the URL, it will download the error instead. You're not sending the problematic header. This is an issu