If you are technically interested into how the versioning, that Votan named above, works I recommand reading this WIKI thread about libraries/dependencies:
https://wiki.esoui.com/Libraries
Especially below the headline "https://wiki.esoui.com/Libraries#Library_versioning"
And below the headline "6 Providing libraries (standalone / bundled with addon, but how?)" you'll find the explanation why embedded libraries in subfolders of addons, not providing their own library.txt file, will most likely break other addons and thus are not welcome any longer.