fakruzaruret the problem is the conflict with michaelbelgium/flarum-discussion-views. You must first remove that other extension, composer remove michaelbelgium/flarum-discussion-views should do it.
The Flarum version warning is because an older version of this extension didn't specify the conflict between the 2, so Composer is trying to install the older version that didn't have the conflict. But that wouldn't solve anything since it was probably conflicting already, just not defined as such in its Composer data.
