Upgrade a Unity 4.68 Car Racing game source code to Unity 2017

Job ID: 30816883

Budget: $499 – $500 USD

I have a stand alone Car Racing game source code built with Unity 4.68.
I want to upgrade it to Unity 2017.4 LTS version for uploading on Google Play Store.
It should support API 29 and 64bit.
I can give you 3 days for it.