Pablo, you might want to try the link again now since it appears to be working. At least it did when I logged out of my IDEA account and went to the page where one would go to sign up for the “free trial.”
Here’s a link to the page that worked for me without any problems:
If you still have no luck, I recommend you contact someone from IDEA using the info Michael provided. I’ll keep my fingers crossed for the best for you, though!