GTA V crash and launch bugs: all fixes as they appear

GTA V players cruising the streets of Los Santos on PC are getting caught up in the wrong sort of crashes today. Corrupt downloads are repeatedly throwing them out of the game and onto the desktop - and depending on where they bought the game, some players have wound up resorting to a complete re-download. Another bug is preventing others from completing the prologue while benchmarking.
Meanwhile, Rockstar have uncovered an installation bug during preparations for launch - though apparently not soon enough to solve it outright. Instead, they've recommended a solution for affected players.
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