Upgrade to Pro!
Step 1: Make sure you already have the FREE edition of aCar (v4.0.0+) installed on your Android 2.1+ device.
Step 2: Purchase the aCar Pro Unlocker app: After installing the Pro Unlocker app, the Pro features will be unlocked on the free edition of aCar. So just continue using the same aCar app you have used so far, and do NOT uninstall it.
Check out the Pro features you will get by upgrading to Pro.