Is there any way I can change this Auth Code of X-cart ?

After a long time of the installaction, we may have fogor the Auth Code, then we can not reinstall the old x-cart. Is there any way I can change this Auth Code then?

The answer is yes!
You can edit …/store/include/install.php.
Open install.php under include, $installation_auth_code = “xxxx”; xxxx will be your Auth Code.

Note: Perhaps it would be best to delete or otherwise make inaccessible the www.yoursite.com/xcart/install.php file.