Regarding the error on the screenshot - I've just checked and there is no such problem, if it happened just once you can ignore it, it maybe just some network problem. If the problem persists you need to ask your hosting provider to investigate this error - particularly why your server can't download this file:

https://github.com/unaio/una/releases/download/9.0.0-RC12/UNA-Patch-v.9.0.0.RC11-to-v.9.0.0.RC12.zip