Full Instruction :

1. Place "Void Eclipse Library" in :

C:\Users\Public\Documents\

- it can be custom place but you need to match it with the "ContentDir" entry in the registry later

2. Create a "Void Eclipse Library" folder in:
C:\Program Files\Common Files\Native Instruments

And put inside the PAResources folder

3. Create a "void eclipse" folder in:

C:\Users\Public\Documents\NI Resources\image

Copy all the files inside the folder "images" in PAResources folder earlier and paste it there

3. Add to Registry

regedit location

[HKEY_LOCAL_MACHINE\SOFTWARE\Native Instruments\Void Eclipse]
- create "Key" (Registry Folder) for Void Eclipse

add "Strings" (later "Modify" to insert the details) for :
"ContentDir"="C:\Users\Public\Documents\Void Eclipse Library"
"ContentVersion"="1.0.0"

Tips : while you were creating the folders and editing registry, you can check out the file structure and format of other Maschine library, it should give you an idea how to place the folders, file and registry strings.