Upgraded PC and lost desktop player ?

Need to admit my ignorance. I have used my original Squeezebox for years and then added a touch. I added a desktop player to access my files that I use to access Touch/Slim Device. I cannot find what the name of the player is/was or the correct download?

I have the Squeezebox app on my iPhone, but that is all I know. I would appreciate a refresher on what I am looking for and where to get the download.

Thank You!