Create new Pathfinder 2e campaign. Enable Theogeek's Improved Critical. Get error on load.
[5/29/2023 4:42:31 PM] [ERROR] Script execution error: [string "..ek-ImprovedCritical:..mprovedCritical.lua"]:441: attempt to index global 'ActionDamage' (a nil value)
It does show up in the chat window as 8.4.2