I followed your instruction concerning the cmd.exe but couldn´t find a startuplog.txt.
That's a copy&paste error.
When you enter
console.exe > startuplog.txt 2>&1
exactly as shown, you will have a startuplog.txt.
Trust me.
PC's don't have their own mind.
If it works for one, it works for all.
Okay, that's the important information.
Your game crashes in the "Landscape" class, line 485, with a "NoSuchMethod" Exception.
Line 484-486 of Landscape.java are:
// TODO: +++ TD AI code backport from 4.13 +++
World.Sun().setAstronomic(config.declin, month, day, World.getTimeofDay(), 0.0F);
// TODO: --- TD AI code backport from 4.13 ---
As you see, this code part has been touched when we have backported 4.13's AI code to Ultrapack.
Some base game class changes were required for this task, which means that old UP3 mods, written before the time of Patch Pack 200, touching the same base classes, will crash the game.
In particular, in your case this is the "Sun" class, where we have introduced a new version of the "setAstronomic" method with a new set of parameters.
You have a mod installed that overwrites this "Sun" class with an outdated version, therefore the new "setAstronomic" method is missing and your game crashes.
I just remembered that in my UP-folder there are still some pretty mods that are really important for me
...and that should have been your very first message.
Unfortunately we modders see this all too often:
"I've installed it exactly to your instructions."
"No, I've got no other mods installed."
And later it turns out that exactly the opposite is true, our mods are just fine and everything was just "user error".
In your case watch out for a file "2CF41F504EF36240".
It must not be anywhere else but in the "UP3 #Patch Pack#" folder.
If you find it somewhere else, then you've found yor conflicting mod.
Best regards - Mike