After updating IR to the latest version, Factorio does not launch with both IR and Krastorio. I also tested with only IR and Krastorio enabled.

From the log file, it is probably due to the most recent IR update removing ammo turret damage research.

As I'm not sure how to upload the log file on this, here is the relevant log file line:
5.163 Mods to disable:Failed to load mods: Krastorio/data-updates.lua:144: ...patibility-scripts/data-updates/IndustrialRevolution.lua:11: ...dustrialRevolution/IndustrialRevolution-technologies.lua:213: attempt to index field 'deadlock-physical-turret-damage-7' (a nil value)

If this doesn't get fixed due to Krastorio 2, I managed to manually fix it. For anyone that wants to fix it themselves, from the Krastorio mod folder, navigate to the directory:
\Krastorio_1.4.43\compatibility-scripts\data-updates\IndustrialRevolution\
Then select the file:
IndustrialRevolution-technologies.lua
Then delete this line:
'data.raw.technology["deadlock-physical-turret-damage-7"].unit.ingredients = military_infinite_ingredients'

Fixed