miui 11 (11.0.2.0)

Hi, I am very new to the whole custom ROM thing and I have been using Xiaomi.eu ROM on my Mi 8 and now my K20 Pro but I can't really find any information on updating that I understand. I would simply like to know how to update MIUI to the newest version of Xiaomi.eu. On the 'Updater' app I get...

First: When choosing the alarm tone / sound, it does not play when the alarm sounds. See photo 3. Two: The messaging application cannot be opened, an error occurs while trying to open it. See photo 1 and 2.