I want to install mathrsfs in my portable TeX Live installation, but tlmgr could not find the font/package. I managed to find it (I think) here. The contents of the archive can be browsed here.
This question's answers about manual font installation are completely unclear to me. Which files do I use and where do I put them? I'm not putting them in TEXMFHOME because, as I said, this is a portable installation. Do I have to run some kind of program to register them with the installation?