I have just installed the trial version of Lightroom and when i go to open the application it comes up with an error saying that Lightroom Catalogs can not be opened on network volumes, removable storage or read only volumes. Do i have to change the location of where the application is stored??
Yes, Lightroom doesn't support the Network Volume as catalog file location, you can keep the Lightroom catalog on the external hard drive.
Move the Catalog to any folder on the same local drive Or simply create new catalog and save it into the Picture folder which suppose to be the default location for Lightroom catalogs.