I would put all three files on three layers in either Premiere or After Effects, and play with the different blend modes and opacity of each layer until the image looks right. Screen, Add, or Overlay modes will probably be worth trying.
I think it means that they've been replaced by other in house effects made by Adobe which work better (ie less processing/rendering needed to create the same effect). Adobe tends to keep the old versions around for backwards compatibility in case you need to open an old project.
This link is to After Effects, but it's the same issue: