Hi! I think your LPSG thread answered the question: they aren't easily found.
That said, I did find the names of all the files:
2007-2011: https://web.archive.org/web/20200925235534/http://www.wh.cz/v2/library.php
2006: https://web.archive.org/web/20200115223036/http://www.wh.cz/v2/library.php?archive=2006
2005: https://web.archive.org/web/20200115224139/http://www.wh.cz/v2/library.php?archive=2005
2004: https://web.archive.org/web/20200115230418/http://www.wh.cz/v2/library.php?archive=2004
2003: https://web.archive.org/web/20200115224416/http://www.wh.cz/v2/library.php?archive=2003
2002: https://web.archive.org/web/20200115230010/http://www.wh.cz/v2/library.php?archive=2002
2001: https://web.archive.org/web/20200115223742/http://www.wh.cz/v2/library.php?archive=2001
If you click on the link you should get a cover image for each file too, which should really help in the search.