fabzor i had same problem like yours, when i trying to start game from l2.exe. so i uninstall mine antivirus/firewall and all run fine.
good day, you can see actual solutions and issues' statuses here: additional instructions cound be found here. if you can't find a solution for your issue you always can ask for moving the theme back into the main branch. and now i'm closing this thread as irrelevant.