Hi. I recommend using the "Hubitat Package Manager" to install it. It's a great way to reduce errors when installing packages and also to get updates when they're available.
Here's a guide to installing HPM:
Once you've installed HPM then open the HPM app in Hubitat and select "Install" -> "Search by Keywords". Enter "squeezebox" for the search criteria and you should see "Squeezebox Connect" in the results. You can then install it via HPM.
