Actually I have to fall back to my problem.
The issue apparently is not solved for me: First Fontsquirrel doesn't do the font-conversions (I don't know if it's a technical issue on their site).
But even when I try to upload a zip file containing some .woff-files I still get the "max size limit exceeded" error.
Now for me it would be suitable to know where I should put the font-files and how to make the system know that those files are available, so that I could see those fonts marked as installed in Font Book.
Can you help me with this?