You will need to remove the files you have copied over from V4.5 for YSCH Coffs Harbour, YPEC Aeropelican and YMUI Murray Island otherwise you will have everything duplicated at those airports with the default airport files now and then when you update those airports with the new Orbx version. New file sets have been created using the new ACIO code for each of these airports. The older file sets are not usable in P3D V5.
When you select YSCH or YCFS at the moment you will actually see two airports on top of one another, the Orbx YSCH and the default YCFS. Best to remove Orbx airports from V5 until they are listed as compatible.