Yeah, there is something fishy going on. I uploaded nativelog.txt content to pastebin: http://pastebin.com/XgAHcUZz Folders \Curse\Minecraft\Install\runtime\jre-x64\1.8.0_25 are created, but they are empty. Why would it even try to download new jre? And why is it failing to do it? Meanwhile, same modpack on FTB launcher works fine!
Installed FTB launcher - everything went smooth at first try. The error occurs when Curse launcher launches minecraft.exe (or I open minecraft.exe by myself). I can open minecraft.jar without an error.
I just did clean windows 10 installation, after that, I cannot launch minecraft... I downloaded Regrowth pack, after clicking play, I get error popup with a message: "Unable to start Minecraft Runtime Environment. This is most likely caused by a corruption. Please try to reinstall Minecraft." At first, I had Java 8 update 66 installed, had this problem, browsed the Web, found that modded minecraft doesn't like Java 8. Ok, uninstalled it, installed Java SE Runtime Environment 7u79. The problem still persists... I can't open minecraft.exe manually either. Now I have no idead, what to do to make it work!