the signature of this program is corrupt or invalid. UnitySetup 3.5.6.exe

Hello :)

I had this exact problem, I couldn't install any program on any browser, I also had installed Norton 360, turns out it was this as when I removed the software, everything functions normally and I just use windows smartscreen for security :)

If you have any purchased security, remove it :)

Hannah

I can't downlode this thing.can somebody help?

thanks.