I updated the zzzDeArchive. You might want to "Verify integrity of game files..." in the game's options of steam. Then give it another try. The new version has logging so you can copy the log.txt and send it if you still have issues. And a new hopefully bug free Windows GUI. So if the Command prompt interface was giving you trouble maybe the new UI will be easier to use.
Possible issue in Command prompt interface:
I had to change the order of the console ui to accept multiple file adds. So Mcindus's instructions might need updated, read the prompts. I highlighted them yellow to hopefully stick out. I've been working on updates all week. Sorry about that.
thanks , but fortunately i don't have any problem with the prompt unpacked and with those three options, infact since the creation of that prompt program i managed to rebuild the main.zzz countless times , the problem only occur with this mod for the new textures , and that's quite the reason why i am asking help , because even after doing correctly all that mecindus said , the game keep crashing, like i said the problem isn't the merge option , it is quite the fact that the game see some new textures , infact i also tried to manually inject the modded textures by using your program in order to extract the .zzz archivie of this mod , so the problem is something in the game , not in the program or in the modded files :\ ; i tried just now the updated version of your unpacker, this time the file mantain the same size and appearently the program succesfully marged the new textures , but when i go in to the game , the new textures just doesn't appear , so clearly the problem is some missing step that we must know about , even this time i tried to manually apply the textures, and even this time the game just crashed, so at this point the possibilities are that macindus and all the other people involved admit that they made the mod to work only for them , or, remember what they forgot to tell us to do, because again , whatever is the method used to inject the new textures , the game keep refusing them, like , we must know about a certain modification to the exe of the game that must be done in order to not reject the modded textures