<p>I need to upload several terabytes of files to SRA. I read about something called &quot;ascp&quot; that works with the Aspera server NCBI uses but I can&#39;t seem to download this software without a user/pass.</p>

<p>Does anyone have this software?</p>

I had this same issue (and asked myself why anyone would use this over rsync), and then found the answer. It is extremely non-intuitive, but you must download the <a href="http://asperasoft.com/software/transfer-clients/connect-web-browser-plug-in/">Aspera Connect browser plugin</a>, and the CLI utility `ascp` is included in that package. If you still have issues, I have it in my <a href="http://db.tt/52vCHLmj">Dropbox</a>.

**Update**: Aspera now maintains this shell script as a separate file. You should now be able to do 

    sh <(curl -s http://demo.asperasoft.com/ascp-install-3.5.4.102989-linux-64.sh)