Polyphony Digital and its developers released a new update for GT Sport today.
Gran Turismo Sport Update 1.52 is now available for download. Below you can find the official patch notes for this update.
Gran Turismo Sport Update 1.52 Patch Notes
Main Features Implemented
Fixed an issue wherein cars could not be purchased and the game would not progress, when a user first created save data using 'Gran Turismo Sport' 1.00 to 1.18 (including PlayStation®Hits version), and then applied Update 1.50 afterwards.
Please note that while this update will fix the save data so you can continue playing the game, the Garage will contain only the Gift Car that is given to you when you first start playing this game.