I just want to warn that the link you guys leave in teh curse forge website is broken, this one. And I'd like to ask what are the requirements to install the EnderStorage-1.16.1-2.6.0.152-universal on my modpack, do I need a core mod or enderstorage is standalone ?

Yes the old website is broken and i haven't gotten around to updating all references to it. EnderStorage for 1.16 has not been released yet, you are on your own in terms of dependencies.