The question may be confusing but i've seen that LoadLibrary is deprecated (not just now), and I found the script on github. Is there a replacement for LoadLibrary and can I just paste this directly into a (e.g: ModuleScript)?
You should check out the devforum post about that here.
But here's a summary of what you can do:
A. Rescript your scripts to not use loadlibrary
B. Add loadlibrary back by using the devforum's steps:
local RbxGui = require(game:GetService("ReplicatedStorage"): WaitForChild("LoadLibrary"):WaitForChild("RbxGui")) -- call RbxGui as usual
You could also change the RbxGui's to RbxUtility and RbxStamper