i havent hellbound and i dont know for what you want the datapack but i give you 1 info...all datapacks arent same. if you find other datapack from other pack you must fix alot sh1ts for work to your server. my opinion and friendly always.
on topic you can checkout and compile with eclipse. 1st you must know what pack you have (acis,l2j for example) and after you can checkout and compile the correct datapack for your pack.