@shreesh Perfect.
All working now.
Thank you!

HI, Running QLO on an Amazon AWS linux instance and turn on debugging as I was getting a 500 error on first install.
The debug returned: Fatal error: Class 'SimpleXMLElement' not found in /var/www/html/hotel/install/classes/simplexml.php on line 27.

Line 27 in mentioned file reads:
class InstallSimplexmlElement extends SimpleXMLElement

I'm going to presume that it may be trying to install something on the server but may not have permissions, however, this is a guess!

Any help gratefully appreciated!