Buona fortuna, tenori!
If you are preparing this for a professional audition, use the IMSLP version to learn the notes, but consider buying the Ricordi edition ($10-$15) for the clean engraving and editorial markings. It’s well worth the investment. Yes, "Amor ti vieta" is on IMSLP. You just have to look for the Fedora vocal score. amor ti vieta imslp
That is where (the Petrucci Music Library) comes in. But is it actually there? And what version should you download? Buona fortuna, tenori