I have downloaded a POP Up widget to my computer. It shows a folder "Pop Up Pros + Demo". When I open the folder it tells me it is a WinRAR zip fil and want me to purchase the application. How do I get the widget into my Muse Widget Library?
Buy it. Download the .zip file. Click to open the .zip and it will decompress into other file(s). There will be a .mulib file. Run that file and it will install your add-on.