PADS Maker Schematic offers up to 1500 connections per project for the Student and Maker versions while PADS Maker Pro Schematic offers unlimited connections. The connection counter at the bottom right of the screen will remain green as long as the current design is within the limit. It will turn red once the limit has been exceeded. Hovering over the connection counter will give you the current number of connections in the design.
The number of connections is the number of module type pins in the design minus one. Special components are ignored in the count.
You can upgrade your license to allow for unlimited connections by purchasing PADS Maker Pro from Digi-Key (See PADS Maker FAQ).