How to download a zip file in linux which size is unknown?

This zip file is of 600mb but when I try to download by lftpget or wget its coming 0kb. At the time of downloading the file in browser its not showing the size of the file.

lftpget "https://login9.unsubcentral.com/unsub/block/resource/MTY4NDQxOTgxOA==/20150927_null_244_unsubs.txt.zip"
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I tried downloading the above file using both lftpget or wget command, I am getting the following error.

Could not find resource at /unsub/block/resource/MTY4NDQxOTgxOA==/20150927_null_244_unsubs.txt.zip

It’s clear that the file is no more exists and that’s the reason you’re getting 0KB while downloading the file…