Thanks for information, i use this solution, but with litte change.
1. "- create an account on TDUWorld.com with exactly the same data you used on testdriveunlimited2.com (login name and password)"
This step is ok.
2. "start the game and create a profile with exactly the same profile name you used" ,"do the tutorial until the game sends you to get the C4 licence and close the game"
Here i use another nickname, a completely new nickname.
I play with game few days ago, but today find Your answer in this topic.
3. "- copy everything from your old profile folder into the new one, overwrite everything"
I think this step not necessary, because i use these steps.
The new profile example we call "Profilehun"
In My old tdu 2 save game use this profile name: "ProfileX"
I registered on tduworld.com website with this profile name: "ProfileX"
I start new game with my new profile "Profilehun".
I push ESC button via game, then choose profiles->i use xbox 360 controller, the "selection bar" on the old profile name.
Then bottom see "edit" menu, click on.
If all correct You see
- old profile name "ProfileX"
-Tdu world nickname "ProfileX"
-Password, here use tdu world account password, then click ok.
If You're lucky, the game load and the old save game work again!