Version 9.2.634 and higher now requires twinBASIC Beta 923 or newer. The project is now using twinBASIC's new Alias syntax support, which is impractical to version ...
@kecartelk the warning is about GENERATE_HTMLHELP not GENERATE_HTML... You did not show the value for this option, but you should disable that unless you want to produce a .chm file with Microsoft's ...