Updated : Proxmox pve 5.2-5 (and Proxmox 6.x) disable subscription nag

In Proxmox pve 5.2-5 (and Proxmox 6.x) the location of the file that renders the subscription notification has changed.

It is now '/usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js'

To disable the message locate the line

" if (data.status !== 'Active') { "

 and comment it out, then add the line

"  if (false) { "

 directly below the one you just commented out.

The section will look like this 

var data = response.result.data;
               //if (data.status !== 'Active') {
               if (false) {
                   Ext.Msg.show({
                       title: gettext('No valid subscription'),

This will not magically give you a full subscription, but it will stop the message popping up