fixes:

-- [string "lib/units/props/timergui.lua"]:655: bad argument #1 to 'floor' (number expected, got nil)
-- [string "lib/units/props/timergui.lua"]:534: attempt to perform arithmetic on field '_current_timer' (a nil value)

-- [string "lib/units/enemies/cop/actions/upper_body/copa..."]:402: attempt to index field '_weapon_base' (a nil value)
-- [string "lib/units/enemies/cop/actions/upper_body/copa..."]:658: attempt to perform arithmetic on local 't' (a userdata value)

-- [string "core/lib/utils/dev/editor/coreworlddefinition..."]:910: attempt to index a number value
-- [string "core/lib/utils/dev/editor/coreworlddefinition..."]:1301: attempt to index a number value

and probably something else
or not

recommend to install it with https://modworkshop.net/mod/52749