Devtest installer file seems to be corrupted

Document ID : KB000093279
Last Modified Date : 27/04/2018
Show Technical Document Details
I run  on Redhat Enterprise  and this error is invoked; 

gzip: sfx_archive.tar.gz: not in gzip format 

I am sorry, but the installer file seems to be corrupted. 
If you downloaded that file please try it again. If you 
transfer that file with ftp please make sure that you are 
using binary mode. 
All supported DevTest environments
This message is generated when the file has been transferred in text mode as opposed to binary. 
You will need to  FTP the file as binary to your Linux machine. Altering the file transfer settings resolved this issue.