Download any of client OS template to the location in Node ( /var/virtualizor/Xen or KVM according to the virtualization).

http://mirror.softaculous.com/virtualizor/templates/windows-2003-x86.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows_2003R264.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows-2008r2.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows-2012server.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows-2003-x86.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows_2003R264.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows-2008r2.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows-2012server.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows-2012r2.img.gz
http://mirror.softaculous.com/virtualizor/templates/windows-2016.img.gz

For example:

cd /var/virtualizor/kvm
wget http://mirror.softaculous.com/virtualizor/templates/windows-2016.img.gz

Then to extract template run :

gunzip TEMPLATE_NAME

For example:

gunzip windows-2016.img.gz

Then add the template using below link :

http://www.virtualizor.com/wiki/Add_OS_Template .