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Vitruvius3 The skin should be fully functional. I'm currently running Leia x64, one of the nightly builds from a few days ago.
This version is the latest one released to the repo. I have worked on some minor fixes since then, but nothing that would cause install issues. The skin requires skinshortcuts version 1.0.18, and that is the latest version in marcel's repo. By now, it's also very old, so that shouldn't be the problem either. I have noticed problems with Leia on windows when downloading many dependencies, and this applies mainly to fresh installs. Basically, during first installs of complex add-ons, Kodi needs to install not just, for example, skinshortcuts, but all the dependencies that skinshortcuts needs, which are usually small add-ons and Python modules. Kodi needs to do it before installing the add-on itself, and so there can potentially be dozens of add-ons that all have to be downloaded and installed that very first time. Subsequent updates are much faster and easier, as these small dependencies are usually not updated that often.
Anyway, it's possible that for whatever reason Kodi had issues downloading one of these files, causing the skinshortcuts dependency to fail to install, which in turn aborted the skin installation, which is the usual reason for such notifications. The problem is, if skinshortcuts doesn't have its proper dependencies installed for whatever reason, the add-on itself won't work properly if pasted in the addons folder, and the skin won't work without the add-on, like a chain reaction. I'm not sure how all this was handled in Krypton, but it seems that something changed in Leia which complicates things, at least for Windows users. Basically, you need to confirm that all the Eminence dependencies managed to install properly (along with their own dependencies), which you can do by installing them one by one from within Kodi (install as zip). That should make sure that, even if previous attempts were incomplete, the add-on itself tracks down its own dependencies and installs them. In the end, you can try and install the skin itself.
As a side note, when you paste a skin directly in the folder, it's automatically disabled. In order to get it to appear in the skin selection menu, you have to enable it from the add-on browser.