adobe extendscript toolkit not working in AE CC

Hey,

I'd like to do some development for AE CC 2015 but the ExtendScript Toolkit doesn't seem to be loaded.

I go to File->Scripts->Open script editor and I get a prompt telling me to install the app from the adobe website. Even though I did that, and the app appears to be installed when looked through the Creative Cloud manager, AE keeps repeating that I have to install ESTK.

Is there an external way to open the script editor (outside of AE), or has anybody experienced the same problem?

Thanks!