If you have not updated already, and have not accepted the licence agreement, clearing the files in the (from memory) C:\ProgramData\NVidia\GeForce\Updates folder seemed to work (Win10), then edit the config file next level up, to change the part regarding accept licence agreement from false to true.
I also discovered that even an uninstall and re-install does not completely revert the shadowplay changes. While you get the old UI back, it seems to be the new 'online only' functionality, so it only appears when you have an internet connection, (not a big deal for ED, but... if you wanted to capture desktop / another game while offline, you cant)
As for reverting, the best source was on the NVidia forum links above and below.
Always be wary of links to old versions not from the nVidia site, I used this:
http://us.download.nvidia.com/GFE/GFECl ... 11.4.0.XXX (replace xxx with exe if you trust that source (I did))
Some also suggest to get the driver bundle again, as it still has the old version in it and do a custom install
As always with forums, the best protection against duff advice, or dodgy downloads, exists above your shoulders!
This thread has some similar / other suggestions:
https://forums.geforce.com/default/topi ... ience-3-0/