Oh, you’re using APDE. It might be a good idea to mention that because APDE is a little different from desktop Android mode.
A quick note: the new sound library is the stock sound library. Minim and Beads are contributed libraries. I sent the link to the GitHub page, but it is also listed on the libraries page.
First, the current version of APDE does not support the sound library, but I have released a new version to the preview channel that supports the sound library. So if you want to use the sound library now, you should join the preview channel and follow the instructions at the top to receive preview builds. (The correct version of APDE is 0.5.1-pre4, or anything later than that.)
What do you mean when you say that you can’t use GitHub? You can download the sound library from the releases page on GitHub (sound.zip). If the “install compressed library” tool doesn’t work, then the manual installation should still work. However, it is possible that the library installer was failing in the past because you were not using a properly formatted library. I have used the zip file that I linked above and it is definitely properly formatted, so you might want to try that first.
If the installer still doesn’t work, then please provide more information about how it fails specifically. Also check previously-created issues on the APDE issue tracker and create a new one if the problem that you are experiencing is not one that has already been described.