To install the modpack, simply go to the link below:
https://steamcommunity.com/sharedfiles/filedetails/?id=3301548568
And click on “subscribe to all”
This will make it so that all the mods will be added to your mod list, but you will have to enable them yourself individually. When all the mods from the modpack are enabled, create a mod pack from the Workshop Hub
Dealing with modpack files is a bit complicated and unreliable, but once it’s done you won’t have to worry about it
First, install the modpack folder using this link, the name of the folder should be named “essentialcalamity”
Then inside the game, go in Workshop Hub → Modpack → Open Modpack Folder
And then drag and drop the “essentialcalamity” folder inside of the “ModPacks” folder