We've just upgraded to IP.Board 4.5. Since 4.4 they included the club/unit feature within the core IPB framework vs needing a plugin. Due to this the plugin creator of Units is no longer supporting it.
There is no easy way to auto convert them over so I'm asking all of the unit administrators to please convert your unit into a club. You can do this here: https://forums.starcitizenbase.com/clubs/
Please get these moved over in the next 30 days so I can remove the Units plugin and upgrade our PHP version here to 7.4.
Let me know if you have any issues converting yours over and I'll help as I can.