Unfortunately,
they at volny.cz deleted the page and now I don't have any backup copy. Please if you have some pages saved, let me know. Thanks. You can download czech XOSL there:
XOSL 1.1.5 CZ
XOSL 1.1.5 CZ Source Code
XOSL FAQ
FAQ EN
FAQ CZ
Thanks to Martin Pav for resending the FAQ.