I think it was a website error. my Pc crashed some time later and i just retried downloading and it worked so maybe i needed to restart my browser or something. incase anyone else (future comment readers) has a similar experience a browser restart or pc restart might be needed.
if your pc crashes you may have a virus on it. Or too many items processing in the background. Check your task manager to see what is running on your pc. If it’s not the above it could be a faulty fan in the pc causing it to shut down. Depends on your make and model it maybe cheaper to buy a used one from your local pawnshop and you can offer a lower price for the item. I suggest you offer around 80-90% of the price they listed. Hope this helps ;)