HI, I have joined tonight and downloaded (successfully) a demo S2_Z to trial.
Apparently it put the download in a temporary internet file now my computer says it can't find it.

I am keen to give this a go, but have no clue as to what I need to do!
Some advise would be grateful, thanks in advance.

Download it again from lfs.net, and then make a folder called LFS on your desktop. Once finished downloading it asks you to extract it and just extract it to your LFS folder on your desktop.