Well I JUST finished watching it for the first time--but forgot the website! Sorry.
Google magic is the next best answer. With 3 rules
#1 If you have to log in, ignore it
#2 If it asks for information, ignore it
#3 If it gives pop ups left and right, ignore it
But I have to say I was not impressed with it. I really thought it was going to be more than what it was.
And from what we read in manga from the naru vs saus fight, Naruto seemed super weak in this movie and it wasnt the best theyve made