Large zip file intermittently fails decompression – Amazon S3

You have 2 choices really with large file download reliability:

1) See if your host supports, or find a host that supports, X_ACCEL_REDIRECT or X_SENDFILE. This protects downloads and serves them via Apache which is more reliable.

2) add_filter( ‘dlm_do_not_force’, ‘__return_true’ ); to your theme functions. You can hook in a more advanced function to only do_not_force certain download IDs if you want to (the function I’ve provided would affect all downloads).