Edit map properties and select all heroes.
It is possible that some spells are banned so do the same for the spells.
Save the map and try again.
@Jorajan, I am sorry but we do not support or fix scripts of third party maps. Unfortunately there is too much things to work on and too less time :(.
However if anyone takes the time to make them compatible with MMH5.5 we will gladly advertise his work.