warning dialog for unsupported groove.exe versions at start and before the first apply of a session (nothing blocked)

docs/manual/20-troubleshooting.md

@@ -104,7 +104,8 @@ after an update, **Settings → Clear cache** throws it away; active mods are re
 
 **Which versions of the game work?**
 The German CD (`groove.exe` of 2001-02-12) and the English first release (2000-10-17) are
-supported, including every mod. With another version the level mods still work, but the mods
+supported, including every mod. With another version LlamaMod shows a warning at start and before
+the first Apply (nothing is blocked); the level mods still work, but the mods
 marked *modifies groove.exe* stop with "unknown program version" – the first lines of
 `logs/apply.log` name the version LlamaMod found. Please report it together with that
 `groove.exe`, then it can be added.