Development Blog, Grand Prix 2009 Assetto Corsa Grand Prix 2009 RB5 + STR4 Mod Released! Posted on December 28, 2022December 28, 2022 by admin 28 Dec We are excited to release next 2 teams from the 2009 Season! STR4 is available as a free download to all RB5 Mod owners. Just re-download the mod from your account’s Downloads Section. Get it here and have Fun! : Assetto Corsa Grand Prix 2009 RB5 + STR4 Mod Assetto Corsa 2009 Mod Development: Update 1.100 Released Assetto Corsa Grand Prix 2009 F1.09 Mod Released!