I noticed that this must be a bug, so I am now reporting it, will get back to tell how it goes
Thanks for discovering this issue and reporting it. We'll take a look on the Support side and see if we can reproduce.
Thanks Richly, I have now found out that it is just in my site, testing it on a alloy and it works great......
I solved it.
The problem was that I was using CMO and I had not run the cmdlet Move-EPiServerProtectedModules. After I did that, it was no problem to install this AddOn.
Great to hear you got it resolved and shared the resolution. Good to know :).
I have just installed this addon with nuget and I am having problem with that it looks in the wrong places for the files.
After I installed it I got a folder named EPiServer.Cms.AddOns.Blocks in my _protected folder and I could create a Self Optimizing block in the editor.
This seems to be that it looks in the wrong place for that file, or should the nuget package be adding files to that directory?