now you can gather the installation data also in the PowershellGallery!
Herefore you just need Powershell v5 / WMF5.
The commands are as follow:
This installation though needs admin rights (also later on) because it is installed in the ModulePath in ProgramFiles. To get around this you can install it into your UserPath this way:
Install-Module PSGUI -Scope CurrentUser
And then you are ready to go!