Hi welcome to the forum.
Firstly the old versions are not available any more, to be honest it is a waste of time downloading them, it is like buying a car that does 2 mph when cars now do 100 mph.
At the moment there are issues with the downloads, I have sent Barry a message and hopefully he might be back on soon.
The old software is not supported, so if you had a problem, then really no one can advise you because we are on later versions.
The demo version is the way to go if you are interested in the software, and seeing if you which to purchase, a lot has changed since the early days and even if it was free, I would not use an older version.
Regards
Mark