I agree that it would be great if someone running Windows could provide the proper compiled lib.dll files. The ones linked above give an error for me (complaining about a missing MSVCP140.dll).
The last compiled libui.dll that still works for me is from an older release by the original author of the library: [https://github.com/andlabs/libui/releases/download/alpha3/alpha3.tar.gz](https://github.com/andlabs/libui/releases/download/alpha3/alpha3.tar.gz) But that version is not compatible with Arag's higher level wrapper anymore, which I would really like to use.
