I could not upgrade from “1.8.9” to “1.8.10” or “1.8.11”
using Chrome “Version 70.0.3538.77 (Official version) 64-bit”
No error message was displayed, I clicked the button and nothing happened.
I got the first attempt “1.8.9” to “1.8.10” using Firefox.
Then I was able to upgrade from “1.8.10” to “1.8.11” using Chrome.