I believe you can use This download link for the libraries
(as listed in LoadLibrary is going to be removed on February 3rd - Updates / Announcements - DevForum | Roblox)
Simply drag the file into roblox studio and move the folder to ReplicatedStorage
Then prepend this to your script:
local LoadLibrary = function(lib) return require(game:GetService("ReplicatedStorage"):WaitForChild("LoadLibrary"):WaitForChild(lib)) end
I see you tried to do the same
NOTE: Only use this for pre-existing scripts where they are too complicated to update and that use RbxGui or RbxStamper