No sorry, it was a false joy, apparently, after a while, the download stops with the following error displayed in the right column of the 7th Heaven interface : A exception occured during a webclient request. And then, if I click "cancel" the temporary file is deleted and it restarted from scratch... :/
UPDATE : after further tests, I confirm that no matter which mod I download, if the process is interrupted or the download cancelled, the temp file is lost and the download begins from the whole beginning, losing the data already downloaded and make it nearly impossible for me to grab the biggest mods...
UPDATE 2 : finally manage to get all the mods by changing computer for one connected by ethernet wire and then transfering the mod files to the first computer, thank you very much !