i can't upgrade from x2pro LE to X2pro via app.

I apologize for your troubles.
The in-app upgrade and all App Store related purchases and problems are all out of our control, and should be directed straight to Apple, as we don't have any control over that part of the process.

The best method i can find on Apple's website is at this link.
reportaproblem.apple.com/
or
getsupport.apple.com/

I hope they are able to get everything resolved for you.

I can't upgrade the x2pro le. When i try it, i get next message "restore failed". I just want to pay the upgrade, not the entire price. Any help?