Ok, just checked on my Unity account, Chris released a fast fix that resolved the build errors.
Tx Chris!!!

U're the best! ^_^
Hi all, hi Chris,
today I tryed to make a build (web and pc) of my game, to see if was running smoothly, but when he was compiling, Unity give some errors and don't create the exe file. Here are the errors found:
Error building Player because scripts had compiler errors
Assets/AdventureCreator/Scripts/Managers/SpeechManager.cs(1424,25): error CS0103: The name `EditorUtility' does not exist in the current context
Assets/AdventureCreator/Scripts/Managers/SpeechManager.cs(1210,17): error CS0103: The name `EditorApplication' does not exist in the current context
Assets/AdventureCreator/Scripts/Managers/SpeechManager.cs(1143,46): error CS0103: The name `GetSceneFiles' does not exist in the current context
And others similar at different lines. I tryed also to open the basement demo, same errors.
Turned on my other pc, open a fresh project with only AC, open the basement demo... same errors... so, i think, this is surely a bug.
I also discovered that if i click on the top menu on Adventure Creator - Editors - Game editors, the window of AC doesn't appear...
The preview works correctly.
I'm the only one that discovered this problem? Or maybe I don't see the post in the forum... in this case, sorry if I made a double... :-\
Bye bye