Because Gravity PDF v4 saw such large changes and wasn’t 100% backwards compatible with v3, we opted to support the 3.x branch for an additional 12 months. That time has now ended and we will no longer provide support or security updates for the 3.x branch. Users are strongly recommended to upgrade to 4.x as soon as possible.
Time certainly flies! It’s been just over 12 months since Gravity PDF v4 was first released, and in that time we’ve shipped 2 major and 8 minor releases.