I subscribed through the MuseScore.com website:

Please contact our friendly support team via this form, or directly by email to [email protected]

Unfortunately, we cannot offer refunds on auto-renewed subscriptions. Read our full refund policy in our Terms of Service.

I subscribed through the MuseScore mobile and tablet app:

All mobile subscription payments are handled by Apple and Google, so any refund requests should be sent directly to Apple or Google Support.