Look at this to see if it helps. If your software was registered in your MySteinberg account you should be eligible for the upgrade and where to download it.
The new soft eLicense # should show up as listed in the steps for reactivation. If not, I would contact support.
How to copy your project folders… not sure what computer OS you have but, for a windows computer I would use File Explorer to go to the project folders. Right click on them and copy to a device (like a usb key). Then connect the key to your new computer and paste them where you want.
Regards 