When I was in California, I could use this software for free.
But now in Spain I cant use it for free… (only free for 30-days trial)
Is this software only free for use in US only?
The graphpad prism in the US is also only a 30 day free trial. And you can only use it once per computer. ( I assume it can recognize your IP address or something else). You can always do the 30 day trial on a different computer.
You might want to start using ggplot2 …free, works everywhere 
and way better in my opinion.