If you previously have aready install Drift Streets: Los Santos, Please read very carefully.

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Upgrade from v1.1/v1.1.0.2 to v1.2
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Replace:
DriftStreetLS.dll

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Upgrade from v1.0 to v1.2
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Replace:
DriftStreetLS.dll
DriftStreetLS\Cars\-566387422.cfg

Insert:
DriftStreetLS\Cars\2072687711.cfg
DriftStreetLS\Cars\-1045541610.cfg
DriftStreetLS\Cars\108773431.cfg
DriftStreetLS\Cars\-1041692462.cfg
DriftStreetLS\Cars\-1995326987.cfg
DriftStreetLS\Cars\-1297672541.cfg
DriftStreetLS\Cars\-142942670.cfg
DriftStreetLS\Cars\-1461482751.cfg
DriftStreetLS\Cars\-746882698.cfg
DriftStreetLS\Cars\633712403.cfg
DriftStreetLS\Cars\-295689028.cfg
DriftStreetLS\ModShop\Kit Sets\2072687711.cfg
DriftStreetLS\ModShop\Kit Sets\-1045541610.cfg
DriftStreetLS\ModShop\Kit Sets\108773431.cfg
DriftStreetLS\ModShop\Kit Sets\-1041692462.cfg
DriftStreetLS\ModShop\Kit Sets\-1995326987.cfg
DriftStreetLS\ModShop\Kit Sets\-1297672541.cfg
DriftStreetLS\ModShop\Kit Sets\-142942670.cfg
DriftStreetLS\ModShop\Kit Sets\-1461482751.cfg
DriftStreetLS\ModShop\Kit Sets\-746882698.cfg
DriftStreetLS\ModShop\Kit Sets\633712403.cfg
DriftStreetLS\ModShop\Kit Sets\-295689028.cfg