A new call added to the last release is not supported by Windows XP. We had to add it to fix some issues with Windows 10 users.
Patch 29 fixes the problem for Windows XP users. You will have to grab the complete installation and install it over the top of your current version to correct the issue.
Happened to me first time today after downloading update. Only I get error code: Initialization Failed With -9 mainWLD_FAILED -1. Can not open game. Windows XP
This error is something else. The only to correct it is to grab the full installation and install over the top of your existing installation.