1 year maintenance agreement for Shutter Stream Software and Support.  You will need an active maintenance agreement to receive technical support and software upgrades.  The first 1 year maintenance agreement is included with the initial purchase.

Enter the number of maintenance agreements in the quantity field:
if less than 1 year, since your maintenance last expired, you need quantity 1,
if more than 1 year but less than 2 years, since your maintenance last expired, you need quantity 2,
if more than 2 years but less than 3 years, since your maintenance last expired, you need quantity 3, etc.

Release notes can be viewed here. Additional information on Maintenance Agreement can be viewed here.