This is now sorted. A brief overview in case its of any use to anyone who ever encounters this.
I downloaded Fiddler which showed that on the initial load, several .js files were being requested which weren't present on the server, hence the problems with the loading of the complete page.
Next, I took the server installation file (QlikViewServer_x64Setup.exe) and extracted its contents using 7-zip. This dumped all the files into a single folder.