All maps from 4.4.1 should work in 4.5. The only thing you need to add are the map.ini parts about the spellbooks.
The only chance that a map might not work in 4.5 is that it uses a map.ini, which is made for 4.4.1. Hence the problem is not our version, but the map.ini (so the map.ini should be fixed)
So there will be no update for this, as there is nothing to fix from our side. If there is something else not working, I recommend either just reinstalling the game or giving us a moer detailled bug report, such that we can help you fixing it.
If you want to open the stanard map, you have to use finalbig and extract them from the __edain_maps.big.
Then you can add them as custom maps in your standard folder. (if you want to change standard maps without adding them as custom maps, then you need to extract them, change them and overwrite the original file in the big file again)