Restoring WWE All Stars DLC on the RPCS3 emulator requires updating the base game to v1.01 or v1.02 and installing both .PKG character data files and .RAP license files. Community-tested methods involve placing the .RAP files into the dev_hdd0/home/00000001/exdata
The DLC for WWE All Stars was released in several packs, primarily focusing on legendary wrestlers and their modern-day counterparts: rpcs3 wwe all stars dlc
.rap license files in: RPCS3\dev_hdd0\home\00000001\exdata\