Yesterday I downloaded the HighRES DLC, with which I am very pleased.
Now I am writing in concern of the latest update, the 43,6 MB one.

Any ideas about what does it do?

Thanks

Isn't there a sticky? It fixes a bunch of stuff. It's a patch. You need it.

The 1.4 update is a patch you want.

Also, once you get the game installed and all that, check the file integrity before you play. Some who got the DLC yesterday had to do that to fix some missing textures.

https://support.steampowered.com/kb_article.php?ref=2037-QEUH-3335