Sorry I'm new to this place, but does anyone knoe which is the most convenient  product to chose for Avid Sibelius. I want a product where I only have to pay only once. And after that could someone explain me the whole process of buying and creating all the accounts. 

Hi William,

  This is the Pro Video Community Forums, for Sibelius Forums click here.

Thanks,
RalphC

William

The best option for what you are looking at is $599.00 Perpetual License w/ Upgrade Plan

Buy it once and own it forever. Comes with an annual Avid upgrade plan that includes all new feature releases for one year. After one year, you'll need to renew your plan to stay current. If you decide not to renew your plan you still get to use the most recent version of software you have but you won't receive any future features, upgrades, or patches.

Marianna