Thanks for the info.
I have downloaded and installed < Europe PC Installer (optional Topographic Data included) > "OpenStreetMap_Europe.zip" 5.15 Go, but no topographic data are included. The installer supposed the topo data were first installed.
With Qlandkartegt, when opening "EUR-350.tdb" file, this sofware ask for a missing file "6nnnnnnn.img" and crashed.
So my question is : where I can find topo data to incude them in OSM_Europe ?