The inclusion of "best" in the search query is telling. It suggests that by the mid-to-late 2000s, many keygens for ASC Timetables 2004 had become unusable due to:
: Software activated with a keygen might not receive official updates or support from the software developers. This can leave users vulnerable to bugs or security issues that are later patched in official updates. keygen asc timetables 2004 best