If you just put the Data folder in on its own it wont work, as you found out. The Data folder still has to be in a folder called  'Aerosoft A318-319 Professional' so the full path will be C:\Users\Your Name\Documents\Aerosoft\Aerosoft A318-319 Professional\Data. Company Route Editor assumes everyone will install the Airbus into the default location so if you change it, it can't find it. You just have to put a copy into the default location but only need the Aerosoft A318-319 Professional\Data