in 2.0 the game only uses the default sprites (and scales them down automatically), the hr_version property gets ignored

ok.
I'm new to mods, so what do I need to change?
Edit:
I think I know what you mean. I will clean up the code and remove the "old" standard definition graphics and there references in the code and set the hr_versions as the new standard definition sprite sources.

correct :)

also the gun turret item is in the wrong subgroup, it should be in "turret" with the order string more like "b[turret]-b[gun-turretLR]"

i hope i'm not annoying you but i found a few other issues:
space age changed the physical projectile damage modifiers.
so i added an optional dependency for space age ("?space-age") (so the mod loads after that) and changed some of the code:
...tech.lua to:
for i,technology in pairs(data.raw.technology) do
for j,effect in pairs(technology.effects or {}) do
if effect.type == "turret-attack" and effect.turret_id == "gun-turret" then
table.insert(technology.effects, {
type = "turret-attack",
turret_id = "lr-gun-turret",
modifier = effect.modifier
})
end
end
end

migration script to:
force.set_turret_attack_modifier("lr-gun-turret", force.get_turret_attack_modifier("gun-turret"))
(this also fixes that physical-projectile-damage-7 would be counted 7 times)

I will have a look at it. Probably tomorrow

I have a Sprite Error

Failed to load mods: The given sprite rectangle (left_top=252x0, right_bottom=504x242) is outside the actual sprite size (left_top=0x0, right_bottom=252x726).
See the log file for more information.: LR_Turret_Redux/graphics/entity/gun-turret/remnants/hr-gun-turret-remnants.png

I was unable to reproduce that error on two different systems. So sadly no idea. If anybody can help me troubleshoot this, highly welcome.

maybe one of his mods is overwriting the make_rotated_animation_variations_from_sheet function globally