Upgrading from Altera DE2 to DE2-115
The DE2-115-board has a different layout so the peripherals on the board are connected differently to the fpga than on the DE2-board.

I would suggest that you read up on how the external peripherals are connected (in the manual for the DE2-115-board) and change that pin mapping in Quartus. You will also have to specify the correct model of the fpga as well so that Quartus will know what part to synthesize for.