Dear Petr, > ln -s pdfcsplain.fmt luacsplain.fmt ... in texmf-var/web2c/luatex/ and > ln -s luatex luacsplain ... in binaries. For windows, cp -p pdfcsplain.fmt luacsplain.fmt (or an independent line luacsplain luatex - -etex csplain.ini in fmtutil.cnf) and cp -p luatex.exe luacsplain.exe Best, Akira