Hi

When I'm trying to finish any brawl (Uthgred the Unbroken, Vilkas or others) my opponent just dies. There is no bounty for this and everybody ignore it. I had some mods installed, but disabling them didn't help. So I uninstalled Skyrim and made clean installation. It didn't help.

This isn't save corruption because the same thing is happening on the "New Game". I was trying brawl bugs patches. I didn't found anybody with the same problem.

Any ideas how to fix this?

Try this patch out: http://www.nexusmods.com/skyrim/mods/24020/?

That will probably solve your issue if it's another mod as well. Make sure it loads early as possible in your load order.

--------------if it doesn't work in your load order:

Try with the Brawl Bug patch at the bottom of the load order. If it still happens, get the compatibility edition of the Brawl Bug patch.

The game looks data up starting with the save file then loose files then plugins via load order from bottom to top.

So if you've got loose PEX files for any of the scripts that the Brawl Bug patch uses they'll take priority over the BSA packed version