Starting June 28th, you will no longer be able to log in to a Curse account that was not merged with a Twitch account. If you have not yet merged your Curse account with a Twitch account, please do so here! Otherwise, your account and its content will be inaccessible.
Hi, Paukstis. Sorry to be the one to break this to you, but you cannot freely use images nor soundtracks found online. Same with assets from games - even if you bought them.
The fact of the matter is - buying a game allows you to play it. And that's about it. Your mileage may vary - it depends on your country's copyrights. In EU it's strictly forbidden, and in fact - punishable by law. You can be charged for hundreds of Euros for copyright infringement. Really. It works that way even if you're "not for profit" or doing it "just as a school project". There's a chance that your country has something like "fair use" (which allows you to e.g. quote something, and in some cases - even lend a book or a movie to your closest friends and family). Funny thing is - games are considered "computer programs", which are not subject to fair use at all, at least where I'm from.
Good luck. And just to be safe - better stay clear of potential copyright infringements!