Well thank you for everything
Everything works now! ^^

have a nice day

And well.
The only "problem" I currently have, when I hover over the turret, the game does not recognize its original name.
It just says "Unknown key: 'entity-name.at-advanced-laser-rangeboost-2' "

Thank you very much.
Although I decided to make a different approach. I changed the file_turret_name (?) of my modded turrets to match the ones created from the other mod. Since I don't rely on endgame combat, just on the additional turrets, that easily doable.
And so far it all works =), I just ...

Well I am currently trying on making endgame combat working in 0.18, but it has some issues, I don't quite get.
Factorio tells me, it tries to index a "nil-value" at the argument:
table.insert(
data.raw["recipe"]
["lightning-turret"].ingredients,
{"steel-plate", 6})

in particular it acts out at ...

For starters,

yes I do see this screen - but only related to another mod I don't use anymore (that also did not recieve updates).
The mod I changed was this mod: (Additional Turrets - https://mods.factorio.com/mod/Additional-Turret-updated )

I have changed the following files:
info.lua (to match ...

Hello,

Thanks for your responce.
Something I forgot to mention is, that the items in my inventory remained in place.

And I didnt changed the migrations "tab" - the game had a problem with a missing "png", but I simply made a new one and gave the mod the new directory. Could this cause any problem ...

Hey there,
I would not consider myself a developer in tthis regards.
But I had my most played factorio based on a mod, that, to this time, does not recieve updates to 0.18.
Because I didnt want to wait any longer, I decided to "update" it myself a bit. I also made it useable in 0.18.
But: Eventhough ...