In OpenXcom Extended 7.12 the mod no longer runs. According to the error indicated in the log:
"[ERROR] During linking rulesets of crafts:
Error for 'STR_AVENGER': Default HWP capacity cannot be negative.
Error for 'STR_LIGHTNING': Default HWP capacity cannot be negative.
Error for 'STR_SKYRANGER': Default HWP capacity cannot be negative."
Discovered the reason - changes in the operation of OXCE. Now the vehicles argument in the Kronos_Mod_crafts.rul file cannot be specified as negative. Here is from its description:
"vehicles - Amount of vehicles this craft can carry. Note: in OXCE, it's the amount of vehicles and 2x2 soldiers. In OXCE, it can also have a value of -1, which means unlimited. Since OXCE v7.10, value -1 is not supported anymore."
Changing to explicitly indicating the number of tanks transported removes the error.