PGPprefs.xml:1: parser error : Document is empty for all commands

Hi 

We use PGP Command Line 10.0 build 674

Migrating from Server 1 to Server 2  

From Rhel 6.8 yto Rhel 7.3 

The difference I see is libxml2 is  

libxml2-2.7.6-21.el6_8.1.x86_64 on Server 1

libxml2-2.9.1-6.el7_2.3.x86_64 on Server 2

/home/user/.pgp/PGPprefs.xml:1: parser error : Document is empty
/home/user/.pgp/PGPprefs.xml:list keys (1009:unable to open preferences file)
-bash-4.2$

- Any ideas ? Please suggest. 

If I have to upgrade , how can I get the download link? I do not want to upgrade as this is non-prod & should match our prod which is in Version 10.0 build 674. 

Thanks