Hi Hans,
I downloaded the fonts in /home/fab/texmf/fonts/opentype/fourier-GUT then :
fab@debian:~$ mtxrun --script fonts --list --all --pattern=*fourier*
resolvers | trees | analyzing 'home:.texlive2015/texmf-config'
resolvers | trees | analyzing 'home:texmf'
fourieralternateblack fourieralternateblack fourier-alt-black.afm
fourieralternatebold fourieralternatebold fourier-alt-bold.afm
fourieralternatebolditalic fourieralternatebolditalic fourier-alt-boldita.afm
fourieralternatebolditalicbold fourieralternatebolditalic fourier-alt-boldita.afm
fourieralternateitalic fourieralternateitalic fourier-alt-ita.afm
fourieralternateitalicnormal fourieralternateitalic fourier-alt-ita.afm
fourieralternateroman fourieralternateroman fourier-alt.afm
fourieralternateromannormal fourieralternateroman fourier-alt.afm
fourieralternatesemibold fourieralternatesemibold fourier-alt-semi.afm
fourieralternatesemitalic fourieralternatesemitalic fourier-alt-semiita.afm
fourieralternatesemitalicsemibold fourieralternatesemitalic fourier-alt-semiita.afm
fouriermathblackboard fouriermathblackboard fourier-bb.afm
fouriermathblackboardblack fouriermathblackboard fourier-bb.afm
fouriermathcal fouriermathcal fourier-mcl.afm
fouriermathcalnormal fouriermathcal fourier-mcl.afm
fouriermathextension fouriermathextension fourier-mex.afm
fouriermathextensionmedium fouriermathextension fourier-mex.afm
fouriermathletters fouriermathletters fourier-ml.afm
fouriermathlettersbold fouriermathlettersbold fourier-mlb.afm
fouriermathlettersbolditalic fouriermathlettersbolditalic fourier-mlitb.afm
fouriermathlettersitalic fouriermathlettersitalic fourier-mlit.afm
fouriermathlettersnormal fouriermathletters fourier-ml.afm
fouriermathsymbols fouriermathsymbols fourier-ms.afm
fouriermathsymbolsbold fouriermathsymbols fourier-ms.afm
fourierorns fourierorns fourier-orns.afm
fourierornsnormal fourierorns fourier-orns.afm
fab@debian:~$
I begin with the text without math :
\starttypescript [serif] [fourier]
\setups[font:fallback:serif]
\definefontsynonym [Fourier-Regular] [file:fourier-alt-black.afm]
\definefontsynonym [Fourier-Italic] [file:fourier-alt-ita.afm]
\definefontsynonym [Fourier-Bold] [file:fourier-alt-bold.afm]
\definefontsynonym [Fourier-BoldItalic] [file:fourier-alt-boldita.afm]
\stoptypescript
\starttypescript [serif] [fourier] [name]
\setups[font:fallback:serif]
\definefontsynonym [Serif] [Fourier-Regular]
\definefontsynonym [SerifItalic] [Fourier-Italic]
\definefontsynonym [SerifBold] [Fourier-Bold]
\definefontsynonym [SerifBoldItalic] [Fourier-BoldItalic]
\stoptypescript
\definetypeface [mainface] [rm] [serif] [fourier] [default]
\setupbodyfont[mainface]
\starttext
\input knuth
\stoptext
Unfortunately, the output file is empty.
Thanks