I am sorry if this sounds insulting, but yesterday someone on this forum said several times that he had followed the instructions on how to install a library but it was still in the wrong place. Are you sure that you have installed all of the library files in the correct place and, if so, what is that place and which files have you installed ?
When do you get the message ""The library DMD-master cannot be used" ?
ah wow I'm an idiot, didn't think the error message was referring to the folder name
You're not an idiot if you learned something. Everyone makes mistakes. Only an idiot makes the same one over and over. A smart person makes new mistakes.