Is there a mod that simply makes the heightmap for Cyrodiil 2x as big? I would make one, but whenever I try to import it the CS crashes.

yep, there is. However, it does not change the actual cyrodiil, but adds a new worldspace with the larger heightmap. I can't find the link atm though :/

The tool to do it is called tesanwynn

But I don't want the animals and stuff scaled up, just the heightmap.

Tesannwyn does not scale animals and other stuff. You can convert the tamriel landscape into a raw file and then re-import that 2x scale.

Really? cool, I'm gonna have to try it out.

Awe, Tesannwyn won't work. I hit open on the exe, a little flash appears and then nothing.

http://www.tesnexus.com/downloads/file.php?id=13911.

EDIT
At least, this is the one Lady Nerevar mentioned, which provides a 2x scale duplicate worldspace, it doesn't edit the original worldspace.



You didn't read the readme. See section 4.

Maybe you should bother and read the readme. TESAnnwyn has a command line interface and clicking on the exe won't do anything since you didn't type any commands.

K