Use the built-in updater. Many crashes are solved simply by moving to a newer version of the software.
: Corrupted cache files are a frequent cause. Right-click the game in your list and select "Delete all caches"
. However, if a recent update caused the crash, some users find success by reverting to an older, more stable build. Check Compatibility : Verify if your game is marked as "Playable" in the RPCS3 Compatibility Database