To use a content pack designed for Flan's Mod 1.7.10 or Flan's Mod Ultimate 1.7.10 like Warfare 44, decompress the JAR/ZIP file of the pack in the "Flan" folder You should then be able to see the ...
Back during the 1.12.2 modding days, I used MCreator to make a mod called the Duplicator Mod. Its purpose was straightforward: It added machines that would allow you to duplicate blocks and items.