Dear Samuli,
Thanks a lot for your answer.
I have enabled the zip download feature and it's perfect! Regarding Plupload, I tried it but I get an "-900 IO error" when I upload many files. I saw in this group that it was maybe a trash collector issue but I was not able to fix it. I don't own the server and I didn't find where to set the "INI" file.
Maybe you can help with that?`
Also I tried to add file by FTP (Fileziolla) on my folder tree and It seems I have permissions issue. I can't upload any files...
Last question, I also tried to have a published foler on a separate server but it seems this is not possible?
Thanks for your answer and sorry for my low knowledge.
Best Regards,