Hello, hopefully someone can help me. (Sorry for my bad English, I used the Google translator. )
I've downloaded a few things and my launcher always said "Installation failed. Please install the latest software updates and try again" (though I've installed a few days ago the new add-on). So I've pulled all my downloads on the two files "decrapify.exe" and "s3rc.exe". The new downloads work now. And now:
About half of the downloads that I had previously installed, no longer as easy to install and it appears the same message, as already said. 
What can I do now?