Even if you find a working crack, you'll be stuck with exactly Sibelius 7.5 as it existed in 2013. You won't receive:
If you have purchased a license or have an educational copy, you activate Sibelius 7.5 legitimately through the Avid Application Manager. Open the Avid Application Manager. Go to the "Apps" tab. Click "Activate" next to Sibelius. Enter the Activation ID and Serial Number provided by Avid. Sibelius 7.5 Activation Code Free
Avid usually offers a 30-day free trial of the full version of Sibelius Ultimate if you want to test the most advanced features. Even if you find a working crack, you'll
– If you have proof of purchase (credit card statement, order number, or retail receipt), support may be able to recover your license. Be prepared that this service may cost a fee for older products. Go to the "Apps" tab