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Unit Upgrades removed

Lord Chatalot There are only a handful of Roman units I would want to remain available. Could you tell me what you would copy and paste, please? And how to unlock, please?

Lord Chatalot Thank-you very much for your reply. I actually want it for the Ancient Empires mod which is a Roman period mod for Attila.

Here's a link to the Attila mod: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=898957896

I've made a mod for Attila, but only for Age of Charlemagne, since the method I used is extremely much work. That was a couple years ago, and I have yet to return to this project, reassess my method, etc.
Minos made a similar mod, but his mod had a few little rough edges afaik, that's why I made my own. If my memory serves both our mods add identical clone versions of units to the game, i.e. 'Spearmen_2', etc. Then you unlock Spearmen_2 via the specific tech and upgrade it to the next tier unit in the same tech, this way the normal 'Spearmen' unit is still recruitable and 'Spearmen_2' becomes 'Spearmen_Tier2'.

Again, it's been a long time, best shot you got is look into the mod files and to try and figure it out on your own. I will warn you though, these mods will require you to change hundreds of database entries over and over again, you will need a lot of time and nerves for this

Lord Chatalot Is there a tutorial on how to do a mod 'No Unit Upgrades' please? I would want to do it for an Attila mod. Thank-you.

@HacaPotato Once the technology that unlocks principes is researched in vanilla Rome II the replaced unit (Hastati in this case) can't be recruited anymore.

It's technically still possible to field Hastati and Principes at the same time by simply not disbanding your older Hastati units, but once those are wiped out there is no possibility to regain any more Hastati units, hence why this mod exists.

"This means that units aren't anymore replaced but rather unlocked, that way you can play with principes and hastati at the same time." But you always could? What does this mod even do then?

Thank you so much for your great explanations Lord Chatalot, this was bodering me and you made it clear. Your mod is a great job and a must have! Thanks!

(2/2) This mod doesn't change any of these quality values, since units like hastati, whiuch were previously replaced, still have their own quality value, even in vanilla. Now I haven't checked what value they actually have, but it should be lower than that of legionaries, so in theory the AI shuld start to recruit legionaries in the later phases of the game, similarly how the AI will replace celtic warriors with noble sword or oathsworn with time.
That means that you will probably encounter a hastati unit here and there in the late game, but in general the AI should build armies consisting out of legionaries & co after having unlocked them.

(1/2) In terms of DEI, I haven't looked at their script so this is a mere guess, but I would argue that the AI follows the same rules as the player.
In terms of this mod, the AI will be able to recruit old units as well. What unit it chooses to recruit isn't based off their stats in the sense that the AI is actually aware of how good the unit is. Instead, each unit has a quality-value assigned, e.g. 800. That means it's possible to give a unit of levy freeman in theory a higher quality value than oathsworn and the AI would accordingly think that levy freemen are actually the better unit.