Can’t Run Unsigned Script?

I have Windows 10 Anniversary Update, and I now can’t seem to run Powershell scripts I get from Github?

I’m trying to install the Powerline Patched Fonts from https://github.com/powerline/fonts, but the script that’s meant to install those fonts won’t run in regular or Administrator mode. The error comes from the script not being signed.

How can I run this or any other unsigned scripts? In settings, I’m in developer mode and the box allowing “local powershell scripts to run without signing” is checked and applied. Why did this not happen to me before this update?