Correct. Anything after 4.3.0.1223 will no longer ship with PlateSolve apps. SGPro will tell you if your sequence uses a PlateSolve solver and will fail during a sequence because it doesnt know where to find it. Should be no surprises there…
All the details for PlateSolve3 will be in the help file. A preview of the yet unreleased help file is here: